Channel multiplexing method and multiplexed channel transmission method for wireless communication system and device using same

ABSTRACT

A base station of a wireless communication system is disclosed. The base station of the wireless communication includes: a communication module; and a processor configured to control the communication module. When a second physical uplink data channel transmission of the UE is scheduled to a time-frequency resource in which uplink control information (UCI) transmission of a first physical uplink data channel of the UE is scheduled, the processor is configured to transmit the UCI to a base station of the wireless communication system in a time-frequency resource except for a time-frequency resource in which a second physical uplink data channel transmission of the UE is scheduled.

TECHNICAL FIELD

The present invention relates to a wireless communication system.Specifically, the present invention relates to a channel multiplexingmethod of a wireless communication system, a multiplexed channeltransmission method and a device using the same.

BACKGROUND ART

After commercialization of 4th generation (4G) communication system, inorder to meet the increasing demand for wireless data traffic, effortsare being made to develop new 5th generation (5G) communication systems.The 5G communication system is called as a beyond 4G networkcommunication system, a post LTE system, or a new radio (NR) system. Inorder to achieve a high data transfer rate, 5G communication systemsinclude systems operated using the millimeter wave (mmWave) band of 6GHz or more, and include a communication system operated using afrequency band of 6 GHz or less in terms of ensuring coverage so thatimplementations in base stations and terminals are under consideration.

A 3rd generation partnership project (3GPP) NR system enhances spectralefficiency of a network and enables a communication provider to providemore data and voice services over a given bandwidth. Accordingly, the3GPP NR system is designed to meet the demands for high-speed data andmedia transmission in addition to supports for large volumes of voice.The advantages of the NR system are to have a higher throughput and alower latency in an identical platform, support for frequency divisionduplex (FDD) and time division duplex (TDD), and a low operation costwith an enhanced end-user environment and a simple architecture.

For more efficient data processing, dynamic TDD of the NR system may usea method for varying the number of orthogonal frequency divisionmultiplexing (OFDM) symbols that may be used in an uplink and downlinkaccording to data traffic directions of cell users. For example, whenthe downlink traffic of the cell is larger than the uplink traffic, thebase station may allocate a plurality of downlink OFDM symbols to a slot(or subframe). Information about the slot configuration should betransmitted to the terminals.

In order to alleviate the path loss of radio waves and increase thetransmission distance of radio waves in the mmWave band, in 5Gcommunication systems, beamforming, massive multiple input/output(massive MIMO), full dimensional MIMO (FD-MIMO), array antenna, analogbeam-forming, hybrid beamforming that combines analog beamforming anddigital beamforming, and large scale antenna technologies are discussed.In addition, for network improvement of the system, in the 5Gcommunication system, technology developments related to evolved smallcells, advanced small cells, cloud radio access network (cloud RAN),ultra-dense network, device to device communication (D2D), vehicle toeverything communication (V2X), wireless backhaul, non-terrestrialnetwork communication (NTN), moving network, cooperative communication,coordinated multi-points (CoMP), interference cancellation, and the likeare being made. In addition, in the 5G system, hybrid FSK and QAMmodulation (FQAM) and sliding window superposition coding (SWSC), whichare advanced coding modulation (ACM) schemes, and filter bankmulti-carrier (FBMC), non-orthogonal multiple access (NOMA), and sparsecode multiple access (SCMA), which are advanced connectivitytechnologies, are being developed.

Meanwhile, in a human-centric connection network where humans generateand consume information, the Internet has evolved into the Internet ofThings (IoT) network, which exchanges information among distributedcomponents such as objects. Internet of Everything (IoE) technology,which combines IoT technology with big data processing technologythrough connection with cloud servers, is also emerging. In order toimplement IoT, technology elements such as sensing technology,wired/wireless communication and network infrastructure, serviceinterface technology, and security technology are required, so that inrecent years, technologies such as sensor network, machine to machine(M2M), and machine type communication (MTC) have been studied forconnection between objects. In the IoT environment, an intelligentinternet technology (IT) service that collects and analyzes datagenerated from connected objects to create new value in human life canbe provided. Through the fusion and mixture of existing informationtechnology (IT) and various industries, IoT can be applied to fieldssuch as smart home, smart building, smart city, smart car or connectedcar, smart grid, healthcare, smart home appliance, and advanced medicalservice.

Accordingly, various attempts have been made to apply the 5Gcommunication system to the IoT network. For example, technologies suchas a sensor network, a machine to machine (M2M), and a machine typecommunication (MTC) are implemented by techniques such as beamforming,MIMO, and array antennas. The application of the cloud RAN as the bigdata processing technology described above is an example of the fusionof 5G technology and IoT technology. Generally, a mobile communicationsystem has been developed to provide voice service while ensuring theuser's activity.

However, the mobile communication system is gradually expanding not onlythe voice but also the data service, and now it has developed to theextent of providing high-speed data service. However, in a mobilecommunication system in which services are currently being provided, amore advanced mobile communication system is required due to a shortagephenomenon of resources and a high-speed service demand of users.

DISCLOSURE Technical Problem

An object of an embodiment of the present invention is to provide amethod and device for transmitting a signal efficiently in a wirelesscommunication system. In addition, an object of an embodiment of thepresent invention is to provide a channel multiplexing method, amultiplexed channel transmission method and a device using the same in awireless communication system.

Technical Solution

According to an embodiment of the present invention, a UE of a wirelesscommunication system includes: a communication module; and a processorconfigured to control the communication module. When a second physicaluplink data channel transmission of the UE is scheduled to atime-frequency resource in which uplink control information (UCI)transmission of a first physical uplink data channel of the UE isscheduled, the processor is configured to transmit the UCI to a basestation of the wireless communication system in a time-frequencyresource except for a time-frequency resource in which the secondphysical uplink data channel transmission of the UE is scheduled.

The processor may be configured to determine whether to transmit the UCIaccording to a type of the UCI.

The processor, when the type of the UCI is a hybrid automatic repeatrequest (HARQ)-ACK, may transmit the UCI, and when the type of the UCIis channel state information (CSI) part1 or CSI part2, may be configuredto drop a transmission of the UCI.

The processor, when the type of the UCI is HARQ-ACK or CSI part1, may beconfigured to transmit the UCI, and when the type of the UCI is CSIpart2, drop a transmission of the UCI.

According to an embodiment of the present invention, a UE of a wirelesscommunication system includes: a communication module; and a processorconfigured to control the communication module. When physical uplinkdata channel transmission of the UE is scheduled in a time-frequencyresource in which physical uplink control channel transmission of the UEis scheduled, the processor is configured to transmit uplink controlinformation (UCI) of a physical uplink control channel to a base stationof the wireless communication system. When the physical uplink datachannel transmission of the UE is scheduled in a time-frequency resourcein which the physical uplink control channel transmission of the UE isscheduled, the processor is configured to determine whether to transmitthe UCI according to a type of the UCI.

The processor, when the type of the UCI is HARQ-ACK, may be configuredto transmit the UCI, and when the type of the UCI is not HARQ-ACK, maybe configured not to transmit the UCI.

When the physical uplink data channel transmission of the UE isscheduled in the time-frequency resource in which the physical uplinkcontrol channel transmission of the UE is scheduled, the processor maybe configured to transmit the physical uplink control channel bypuncturing a time resource that overlaps a time resource in which thephysical uplink data channel transmission of the UE is scheduled in atime-frequency resource in which the physical uplink control channeltransmission of the UE is scheduled.

When the physical uplink data channel transmission of the UE isscheduled in the time-frequency resource in which the physical uplinkcontrol channel transmission of the UE is scheduled, the processor maybe configured to transmit the physical uplink data channel by puncturingthe physical uplink data channel of the UE scheduled in a time-frequencyresource in which the transmission of the physical uplink controlchannel is scheduled in a time-frequency resource in which the physicaluplink data channel transmission of the UE is scheduled.

The processor may be configured to transmit the UCI of the physicaluplink control channel in N symbols behind the time-frequency resourcein which the physical uplink data channel is transmitted, wherein N maybe a natural number.

According to an embodiment of the present invention, a UE of a wirelesscommunication system includes: a communication module; and a processorconfigured to control the communication module, wherein whentransmission of a first physical uplink control channel of the UE and asecond physical uplink control channel of the UE is scheduled in onesymbol, the processor is configured to transmit the first physicaluplink control channel in a time-frequency resource in which the firstphysical uplink control channel is scheduled, and transmit the secondphysical uplink control channel in another time-frequency resource inwhich the first physical uplink control channel does not overlap withthe scheduled time-frequency resource.

The processor may be configured to select another time-frequencyresource among the plurality of time-frequency resource based on aposition of a last symbol of each of a plurality of time-frequencyresources configured for transmission of a physical uplink controlchannel in the slot.

The processor may be configured to consider a position of a last symbolof each of the plurality of time-frequency resources, and then selectanother time-frequency resource by considering the number of symbols ofeach of the plurality of time-frequency resources.

The processor may be configured to select a time-frequency resourcehaving a last symbol equal to or ahead of the latest symbol in thetime-frequency resource in which the transmission of the first physicaluplink control channel is scheduled and in the time-frequency resourcein which the transmission of the second physical uplink control channelis scheduled as another time-frequency resource.

Based on downlink control information (DCI) indicating transmission ofat least one of two physical uplink control channels including the firstphysical uplink control channel and the second physical uplink controlchannel, the processor may be configured to determine the first physicaluplink control channel and the second physical uplink control channelamong the two physical uplink control channels.

The processor may be configured to determine the first physical uplinkcontrol channel and the second physical uplink control channel among thetwo physical uplink control channels based on a type of uplink controlinformation (UCI) of each of the two physical uplink control channels.

The processor may be configured to determine a physical uplink controlchannel in which the type of the UCI is a hybrid automatic request(HARQ)-ACK among the two physical uplink control channels as the firstphysical uplink control channel, and determine a physical uplink controlchannel in which the type of the UCI is channel state information (CSI)among the two physical uplink control channels as the second physicaluplink control channel.

According to an embodiment of the present invention, a UE of a wirelesscommunication system includes: a communication module; and a processorconfigured to control the communication module, wherein when grant-basedphysical uplink data channel transmission by the UE is scheduled in atime-frequency resource in which grant-free physical uplink data channeltransmission by the UE is scheduled, and there is data to be transmittedthrough the grant-free physical uplink data channel, the processor isconfigured to drop the grant-based physical uplink data channeltransmission and transmit the grant-free physical uplink data channel.

When dropping the grant-based physical uplink data channel transmissionand transmitting the grant-free physical uplink data channel, theprocessor may be configured to transmit uplink control information (UCI)to be transmitted through the grant-based physical uplink data channelthrough the grant-free physical uplink data channel.

When there is data to be transmitted through the grant-free physicaluplink data channel, and a transmission period of the grant-freephysical uplink data channel is shorter than a specific period, theprocessor may drop the grant-based physical uplink data channeltransmission and transmit the grant-free physical uplink data channel.

According to an embodiment of the present invention, a UE operationmethod of a wireless communication system includes, when a secondphysical uplink data channel transmission of the UE is scheduled to atime-frequency resource in which uplink control information (UCI)transmission of a first physical uplink data channel of the UE isscheduled, transmitting the UCI to a base station of the wirelesscommunication system in a time-frequency resource except for atime-frequency resource in which a second physical uplink data channeltransmission of the UE is scheduled.

The transmitting the UCI includes determining whether to transmit theUCI according to a type of the UCI.

The determining whether to transmit the UCI includes: when the type ofthe UCI is a hybrid automatic repeat request (HARQ)-ACK, transmittingthe UCI; and when the type of the UCI is channel state information (CSI)part1 or CSI part2, dropping the transmission of the UCI.

The determining whether to transmit the UCI includes: when the type ofthe UCI is hybrid automatic repeat request (HARQ)-ACK or channel stateinformation (CSI) part1, transmitting the UCI; and when the type of theUCI is CSI part2, dropping the transmission of the UCI.

According to an embodiment of the present invention, a UE operationmethod of a wireless communication system includes, when physical uplinkdata channel transmission of the UE is scheduled in a time-frequencyresource in which physical uplink control channel transmission of the UEis scheduled, transmitting uplink control information (UCI) of aphysical uplink control channel to a base station of the wirelesscommunication system.

The transmitting the UCI to the base station of the wirelesscommunication system includes when the physical uplink data channeltransmission of the UE is scheduled in a time-frequency resource inwhich the physical uplink control channel transmission of the UE isscheduled, determining whether to transmit the UCI according to the typeof the UCI.

The determining the transmitting the UCI according to the type of theUCI includes when the type of the UCI is HARQ-ACK, transmitting the UCI,and when the type of the UCI is not HARQ-ACK, not transmitting the UCI.

The operation method may further include, when the physical uplink datachannel transmission of the UE is scheduled in the time-frequencyresource in which the physical uplink control channel transmission ofthe UE is scheduled, transmitting the physical uplink control channel bypuncturing a time resource that overlaps a time resource in which thephysical uplink data channel transmission of the UE is scheduled in atime-frequency resource in which the physical uplink control channeltransmission of the UE is scheduled.

The operation method may further include, when the physical uplink datachannel transmission of the UE is scheduled in the time-frequencyresource in which the physical uplink control channel transmission ofthe UE is scheduled, transmitting the physical uplink data channel bypuncturing the physical uplink data channel of the UE that is scheduledin a time-frequency resource in which the transmission of the physicaluplink control channel is scheduled in a time-frequency resource inwhich the physical uplink data channel transmission of the UE isscheduled.

The operation method may further include transmitting the UCI of thephysical uplink control channel in N symbols behind the time-frequencyresource in which the physical uplink data channel is transmitted,wherein N may be a natural number.

According to an embodiment of the present invention, a UE operationmethod of a wireless communication system includes: when transmission ofa first physical uplink control channel of the UE and a second physicaluplink control channel of the UE is scheduled in one symbol,transmitting the first physical uplink control channel in atime-frequency resource in which the first physical uplink controlchannel is scheduled, and transmitting the second physical uplinkcontrol channel in another time-frequency resource in which the firstphysical uplink control channel does not overlap with the scheduledtime-frequency resource.

The transmitting the second physical uplink control channel may includeselecting the other time-frequency resource among the plurality oftime-frequency resources based on a position of a last symbol of each ofa plurality of time-frequency resources configured for transmission of aphysical uplink control channel in the slot.

The selecting the other time-frequency resource may include consideringa position of a last symbol of each of the plurality of time-frequencyresources, and then selecting the other time-frequency resources byconsidering the number of symbols of each of the plurality oftime-frequency resources.

The transmitting the second physical uplink control channel may includeselecting a time-frequency resource having a last symbol equal to orahead of the latest symbol in the time-frequency resource in which thetransmission of the first physical uplink control channel is scheduledand in the time-frequency resource in which the transmission of thesecond physical uplink control channel is scheduled as the othertime-frequency resource.

The transmitting the second physical uplink control channel may includebased on downlink control information (DCI) indicating transmission ofat least one of two physical uplink control channels including the firstphysical uplink control channel and the second physical uplink controlchannel, determining the first physical uplink control channel and thesecond physical uplink control channel among the two physical uplinkcontrol channels.

The determining the first physical uplink control channel and the secondphysical uplink control channel may include determining the firstphysical uplink control channel and the second physical uplink controlchannel among the two physical uplink control channels based on a typeof uplink control information (UCI) of each of the two physical uplinkcontrol channels.

The determining the first physical uplink control channel and the secondphysical uplink control channel among the two physical uplink controlchannels based on the UCI type may include determining a physical uplinkcontrol channel in which the type of the UCI is a HARQ-ACK among the twophysical uplink control channels as the first physical uplink controlchannel, and determines a physical uplink control channel in which thetype of the UCI is CSI among the two physical uplink control channels asthe second physical uplink control channel.

According to an embodiment of the present invention, a UE operationmethod of a wireless communication system includes: when grant-basedphysical uplink data channel transmission by the UE is scheduled in atime-frequency resource in which grant-free physical uplink data channeltransmission by the UE is scheduled, and there is data to be transmittedthrough the grant-free physical uplink data channel, dropping thegrant-based physical uplink data channel transmission and transmittingthe grant-free physical uplink data channel.

The dropping he grant based physical uplink data channel transmissionand transmitting the grant-free physical uplink data channel mayinclude, when dropping the grant-based physical uplink data channeltransmission and transmitting the grant-free physical uplink datachannel, transmitting uplink control information (UCI) to be transmittedthrough the grant-based physical uplink data channel through thegrant-free physical uplink data channel.

The dropping the grant based physical uplink data channel transmissionand transmitting the grant-free physical uplink data channel mayinclude, when there is data to be transmitted through the grant-freephysical uplink data channel, and a transmission period of thegrant-free physical uplink data channel is shorter than a specificperiod, dropping the grant-based physical uplink data channeltransmission and transmitting the grant free physical uplink datachannel.

Advantageous Effects

One embodiment of the present invention provides a method forefficiently multiplexing channels in a wireless communication system, amethod for receiving a multiplexed channel, and a device using the same.

Effects obtainable from various embodiments of the present disclosureare not limited to the above-mentioned effects, and other effects notmentioned above may be clearly derived and understood to those skilledin the art from the following description.

DESCRIPTION OF DRAWINGS

FIG. 1 illustrates an example of a wireless frame structure used in awireless communication system;

FIG. 2 illustrates an example of a downlink (DL)/uplink (UL) slotstructure in a wireless communication system;

FIG. 3 is a diagram for explaining a physical channel used in a 3GPPsystem and a typical signal transmission method using the physicalchannel;

FIG. 4 illustrates an SS/PBCH block for initial cell access in a 3GPP NRsystem;

FIG. 5 illustrates a procedure for transmitting control information anda control channel in a 3GPP NR system;

FIG. 6 illustrates a control resource set (CORESET) in which a physicaldownlink control channel (PUCCH) may be transmitted in a 3GPP NR system;

FIG. 7 illustrates a method for configuring a PDCCH search space in a3GPP NR system;

FIG. 8 is a conceptual diagram illustrating carrier aggregation;

FIG. 9 is a diagram for explaining signal carrier communication andmultiple carrier communication;

FIG. 10 is a diagram showing an example in which a cross carrierscheduling technique is applied;

FIG. 11 is a block diagram showing the configurations of a UE and a basestation according to an embodiment of the present disclosure;

FIG. 12 shows a preemption indicator used in a wireless communicationsystem according to an embodiment of the present invention.

FIG. 13 shows a range of a physical uplink data channel that a UEaccording to an embodiment of the present invention cannot transmit dueto preemption.

FIG. 14 shows an operation in which a UE transmits a PUSCH that cannotbe transmitted due to preemption according to an embodiment of thepresent invention.

FIG. 15 shows a range of a physical uplink data channel that a UEaccording to another embodiment of the present invention cannot transmitdue to preemption.

FIG. 16 shows an operation in which the UE transmits DMRS and UCI thatcannot be transmitted due to preemption according to an embodiment ofthe present invention.

FIG. 17 shows a method for a UE to select an alternate physical uplinkcontrol channel according to an embodiment of the present invention.

MODE FOR CARRYING OUT THE INVENTION

Terms used in the specification adopt general terms which are currentlywidely used as possible by considering functions in the presentinvention, but the terms may be changed depending on an intention ofthose skilled in the art, customs, and emergence of new technology.Further, in a specific case, there is a term arbitrarily selected by anapplicant and in this case, a meaning thereof will be described in acorresponding description part of the invention. Accordingly, it intendsto be revealed that a term used in the specification should be analyzedbased on not just a name of the term but a substantial meaning of theterm and contents throughout the specification.

Throughout this specification and the claims that follow, when it isdescribed that an element is “connected” to another element, the elementmay be “directly connected” to the other element or “electricallyconnected” to the other element through a third element. Further, unlessexplicitly described to the contrary, the word “comprise” will beunderstood to imply the inclusion of stated elements but not theexclusion of any other elements unless otherwise stated. Moreover,limitations such as “more than or equal to” or “less than or equal to”based on a specific threshold may be appropriately substituted with“more than” or “less than”, respectively, in some exemplary embodiments.

The following technology may be used in various wireless access systems,such as code division multiple access (CDMA), frequency divisionmultiple access (FDMA), time division multiple access (TDMA), orthogonalfrequency division multiple access (OFDMA), single carrier-FDMA(SC-FDMA), and the like. The CDMA may be implemented by a wirelesstechnology such as universal terrestrial radio access (UTRA) orCDMA2000. The TDMA may be implemented by a wireless technology such asglobal system for mobile communications (GSM)/general packet radioservice (GPRS)/enhanced data rates for GSM evolution (EDGE). The OFDMAmay be implemented by a wireless technology such as IEEE 802.11(Wi-Fi),IEEE 802.16(WiMAX), IEEE 802-20, evolved UTRA (E-UTRA), and the like.The UTRA is a part of a universal mobile telecommunication system(UMTS). 3rd generation partnership project (3GPP) long term evolution(LTE) is a part of an evolved UMTS (E-UMTS) using evolved-UMTSterrestrial radio access (E-UTRA) and LTE-advanced (A) is an evolvedversion of the 3GPP LTE. 3GPP new radio (NR) is a system designedseparately from LTE/LTE-A, and is a system for supporting enhancedmobile broadband (eMBB), ultra-reliable and low latency communication(URLLC), and massive machine type communication (mMTC) services, whichare requirements of IMT-2020. For the clear description, 3GPP NR ismainly described, but the technical idea of the present invention is notlimited thereto.

Unless otherwise specified herein, the base station may include a nextgeneration node B (gNB) defined in 3GPP NR. Furthermore, unlessotherwise specified, a terminal may include a user equipment (UE).Hereinafter, in order to help the understanding of the description, eachcontent is described separately by the embodiments, but each embodimentmay be used in combination with each other. In the presentspecification, the configuration of the UE may indicate a configurationby the base station. In more detail, the base station may configure avalue of a parameter used in an operation of the UE or a wirelesscommunication system by transmitting a channel or a signal to the UE.

FIG. 1 illustrates an example of a wireless frame structure used in awireless communication system.

Referring to FIG. 1 , the wireless frame (or radio frame) used in the3GPP NR system may have a length of 10 ms (Δf_(max)N_(f)/100)*T_(c)). Inaddition, the wireless frame includes 10 subframes (SFs) having equalsizes. Herein, Δf_(max)=480*10³ Hz, N_(f)=4096,T_(c)=1/(Δf_(ref)*N_(f,ref)), Δf_(ref)=15*10³ Hz, and N_(f,ref)=2048.Numbers from 0 to 9 may be respectively allocated to 10 subframes withinone wireless frame. Each subframe has a length of 1 ms and may includeone or more slots according to a subcarrier spacing. More specifically,in the 3GPP NR system, the subcarrier spacing that may be used is15*2^(μ) kHz, and μ can have a value of μ=0, 1, 2, 3, 4 as subcarrierspacing configuration. That is, 15 kHz, 30 kHz, 60 kHz, 120 kHz and 240kHz may be used for subcarrier spacing. One subframe having a length of1 ms may include 2^(μ) slots. In this case, the length of each slot is2^(−μ) ms. Numbers from 0 to 2^(μ)−1 may be respectively allocated to2^(μ) slots within one wireless frame. In addition, numbers from 0 to10*2^(μ)−1 may be respectively allocated to slots within one subframe.The time resource may be distinguished by at least one of a wirelessframe number (also referred to as a wireless frame index), a subframenumber (also referred to as a subframe index), and a slot number (or aslot index).

FIG. 2 illustrates an example of a downlink (DL)/uplink (UL) slotstructure in a wireless communication system. In particular, FIG. 2shows the structure of the resource grid of the 3GPP NR system.

There is one resource grid per antenna port. Referring to FIG. 2 , aslot includes a plurality of orthogonal frequency division multiplexing(OFDM) symbols in a time domain and includes a plurality of resourceblocks (RBs) in a frequency domain. An OFDM symbol also means one symbolsection. Unless otherwise specified, OFDM symbols may be referred tosimply as symbols. One RB includes 12 consecutive subcarriers in thefrequency domain. Referring to FIG. 2 , a signal transmitted from eachslot may be represented by a resource grid including N^(size,μ)_(grid,x)*N^(RB) _(sc) subcarriers, and Ns^(lot) _(symb) OFDM symbols.Here, x=DL when the signal is a DL signal, and x=UL when the signal isan UL signal. N^(size,μ) _(grid,x) represents the number of resourceblocks (RBs) according to the subcarrier spacing constituent μ (x is DLor UL), and N^(slot) _(symb) represents the number of OFDM symbols in aslot. N^(RB) _(sc) is the number of subcarriers constituting one RB andN^(RB) _(sc)=12. An OFDM symbol may be referred to as a cyclic shiftOFDM (CP-OFDM) symbol or a discrete Fourier transform spread OFDM(DFT-s-OFDM) symbol according to a multiple access scheme.

The number of OFDM symbols included in one slot may vary according tothe length of a cyclic prefix (CP). For example, in the case of a normalCP, one slot includes 14 OFDM symbols, but in the case of an extendedCP, one slot may include 12 OFDM symbols. In a specific embodiment, theextended CP can only be used at 60 kHz subcarrier spacing. In FIG. 2 ,for convenience of description, one slot is configured with 14 OFDMsymbols by way of example, but embodiments of the present disclosure maybe applied in a similar manner to a slot having a different number ofOFDM symbols. Referring to FIG. 2 , each OFDM symbol includes N^(size,μ)_(grid,x)*N^(RB) _(sc) subcarriers in the frequency domain. The type ofsubcarrier may be divided into a data subcarrier for data transmission,a reference signal subcarrier for transmission of a reference signal,and a guard band. The carrier frequency is also referred to as thecenter frequency (fc).

One RB may be defined by N^(RB) _(sc) (e. g., 12) consecutivesubcarriers in the frequency domain. For reference, a resourceconfigured with one OFDM symbol and one subcarrier may be referred to asa resource element (RE) or a tone. Therefore, one RB can be configuredwith N^(size,μ)*N^(RB) _(sc) resource elements. Each resource element inthe resource grid can be uniquely defined by a pair of indexes (k, l) inone slot. k may be an index assigned from 0 to N^(size,μ)_(grid,x)*N^(RB) _(sc)−1 in the frequency domain, and l may be an indexassigned from 0 to N^(slot) _(symb)−1 in the time domain.

In order for the UE to receive a signal from the base station or totransmit a signal to the base station, the time/frequency of the UE maybe synchronized with the time/frequency of the base station. This isbecause when the base station and the UE are synchronized, the UE candetermine the time and frequency parameters necessary for demodulatingthe DL signal and transmitting the UL signal at the correct time.

Each symbol of a radio frame used in a time division duplex (TDD) or anunpaired spectrum may be configured with at least one of a DL symbol, anUL symbol, and a flexible symbol. A radio frame used as a DL carrier ina frequency division duplex (FDD) or a paired spectrum may be configuredwith a DL symbol or a flexible symbol, and a radio frame used as a ULcarrier may be configured with a UL symbol or a flexible symbol. In theDL symbol, DL transmission is possible, but UL transmission isimpossible. In the UL symbol, UL transmission is possible, but DLtransmission is impossible. The flexible symbol may be determined to beused as a DL or an UL according to a signal.

Information on the type of each symbol, i.e., information representingany one of DL symbols, UL symbols, and flexible symbols, may beconfigured with a cell-specific or common radio resource control (RRC)signal. In addition, information on the type of each symbol mayadditionally be configured with a UE-specific or dedicated RRC signal.The base station informs, by using cell-specific RRC signals, i) theperiod of cell-specific slot configuration, ii) the number of slots withonly DL symbols from the beginning of the period of cell-specific slotconfiguration, iii) the number of DL symbols from the first symbol ofthe slot immediately following the slot with only DL symbols, iv) thenumber of slots with only UL symbols from the end of the period of cellspecific slot configuration, and v) the number of UL symbols from thelast symbol of the slot immediately before the slot with only the ULsymbol. Here, symbols not configured with any one of a UL symbol and aDL symbol are flexible symbols.

When the information on the symbol type is configured with theUE-specific RRC signal, the base station may signal whether the flexiblesymbol is a DL symbol or an UL symbol in the cell-specific RRC signal.In this case, the UE-specific RRC signal can not change a DL symbol or aUL symbol configured with the cell-specific RRC signal into anothersymbol type. The UE-specific RRC signal may signal the number of DLsymbols among the N^(slot) _(symb) symbols of the corresponding slot foreach slot, and the number of UL symbols among the N^(slot) _(symb)symbols of the corresponding slot. In this case, the DL symbol of theslot may be continuously configured with the first symbol to the i-thsymbol of the slot. In addition, the UL symbol of the slot may becontinuously configured with the j-th symbol to the last symbol of theslot (where i In the slot, symbols not configured with any one of a ULsymbol and a DL symbol are flexible symbols.

The type of symbol configured with the above RRC signal may be referredto as a semi-static DL/UL configuration. In the semi-static DL/ULconfiguration previously configured with RRC signals, the flexiblesymbol may be indicated as a DL symbol, an UL symbol, or a flexiblesymbol through dynamic slot format information (SFI) transmitted on aphysical DL control channel (PDCCH). In this case, the DL symbol or ULsymbol configured with the RRC signal is not changed to another symboltype. Table 1 exemplifies the dynamic SFI that the base station canindicate to the UE.

TABLE 1 Symbol number in a slot index 0 1 2 3 4 5 6 7 8 9 10 11 12 13 0D D D D D D D D D D D D D D 1 U U U U U U U U U U U U U U 2 X X X X X XX X X X X X X X 3 D D D D D D D D D D D D D X 4 D D D D D D D D D D D DX X 5 D D D D D D D D D D D X X X 6 D D D D D D D D D D X X X X 7 D D DD D D D D D X X X X X 8 X X X X X X X X X X X X X X 9 X X X X X X X X XX X X U U 10 X U U U U U U U U U U U U U 11 X X U U U U U U U U U U U U12 X X X U U U U U U U U U U U 13 X X X X U U U U U U U U U U 14 X X X XX U U U U U U U U U 15 X X X X X X U U U U U U U U 16 D X X X X X X X XX X X X X 17 D D X X X X X X X X X X X X 18 D D D X X X X X X X X X X X19 D X X X X X X X X X X X X X 20 D D X X X X X X X X X X X X 21 D D D XX X X X X X X X X X 22 D X X X X X X X X X X X X X 23 D D X X X X X X XX X X X X 24 D D D X X X X X X X X X X X 25 D X X X X X X X X X X X X X26 D D X X X X X X X X X X X X 27 D D D X X X X X X X X X X X 28 D D D DD D D D D D D D X U 29 D D D D D D D D D D D X X U 30 D D D D D D D D DD X X X U 31 D D D D D D D D D D D X U U 32 D D D D D D D D D D X X U U33 D D D D D D D D D D X X U U 34 D U U U U U U U U U U U U U 35 D D X UU U U U U U U U U U 36 D D D X U U U U U U U U U U 37 D X X U U U U U UU U U U U 38 D D X X U U U U U U U U U U 39 D D D X X U U U U U U U U U40 D X X X U U U U U U U U U U 41 D D X X X U U U U U U U U U 42 D D D XX X U U U U U U U U 43 D D D D D D D D D X X X X U 44 D D D D D D X X XX X X U U 45 D D D D D D X X U U U U U U 46 D D D D D X U D D D D D X U47 D D X U U U U D D X U U U U 48 D X U U U U U D X U U U U U 49 D D D DX X U D D D D X X U 50 D D X X U U U D D X X U U U 51 D X X U U U U D XX U U U U 52 D X X X X X U D X X X X X U 53 D D X X X X U D D X X X X U54 X X X X X X X D D D D D D D 55 D D X X X U U U D D D D D D 56-256Reserved

In Table 1, D denotes a DL symbol, U denotes a UL symbol, and X denotesa flexible symbol. As shown in Table 1, up to two DL/UL switching in oneslot may be allowed.

FIG. 3 is a diagram for explaining a physical channel used in a 3GPPsystem (e.g., NR) and a typical signal transmission method using thephysical channel.

If the power of the UE is turned on or the UE camps on a new cell, theUE performs an initial cell search (S101). Specifically, the UE maysynchronize with the BS in the initial cell search. For this, the UE mayreceive a primary synchronization signal (PSS) and a secondarysynchronization signal (SSS) from the base station to synchronize withthe base station, and obtain information such as a cell ID. Thereafter,the UE can receive the physical broadcast channel from the base stationand obtain the broadcast information in the cell.

Upon completion of the initial cell search, the UE receives a physicaldownlink shared channel (PDSCH) according to the physical downlinkcontrol channel (PDCCH) and information in the PDCCH, so that the UE canobtain more specific system information than the system informationobtained through the initial cell search (S102). Herein, the systeminformation received by the UE is cell-common system information fornormal operating of the UE in a physical layer in radio resource control(RRC) and is referred to remaining system information, or systeminformation block (SIB) 1 is called.

When the UE initially accesses the base station or does not have radioresources for signal transmission (i.e. the UE at RRC IDLE mode), the UEmay perform a random access procedure on the base station (operationsS103 to S106). First, the UE can transmit a preamble through a physicalrandom access channel (PRACH) (S103) and receive a response message forthe preamble from the base station through the PDCCH and thecorresponding PDSCH (S104). When a valid random access response messageis received by the UE, the UE transmits data including the identifier ofthe UE and the like to the base station through a physical uplink sharedchannel (PUSCH) indicated by the UL grant transmitted through the PDCCHfrom the base station (S105). Next, the UE waits for reception of thePDCCH as an indication of the base station for collision resolution. Ifthe UE successfully receives the PDCCH through the identifier of the UE(S106), the random access process is terminated. The UE may obtainUE-specific system information for normal operating of the UE in thephysical layer in RRC layer during a random access process. When the UEobtains the UE-specific system information, the UE enters RRC connectingmode (RRC CONNECTED mode).

The RRC layer is used for generating or managing message for controllingconnection between the UE and radio access network (RAN). In moredetail, the base station and the UE, in the RRC layer, may performbroadcasting cell system information required by every UE in the cell,managing mobility and handover, measurement report of the UE, storagemanagement including UE capability management and device management. Ingeneral, the RRC signal is not changed and maintained quite longinterval since a period of an update of a signal delivered in the RRClayer is longer than a transmission time interval (TTI) in physicallayer.

After the above-described procedure, the UE receives PDCCH/PDSCH (S107)and transmits a physical uplink shared channel (PUSCH)/physical uplinkcontrol channel (PUCCH) (S108) as a general UL/DL signal transmissionprocedure. In particular, the UE may receive downlink controlinformation (DCI) through the PDCCH. The DCI may include controlinformation such as resource allocation information for the UE. Also,the format of the DCI may vary depending on the intended use. The uplinkcontrol information (UCI) that the UE transmits to the base stationthrough UL includes a DL/UL ACK/NACK signal, a channel quality indicator(CQI), a precoding matrix index (PMI), a rank indicator (RI), and thelike. Here, the CQI, PMI, and RI may be included in channel stateinformation (CSI). In the 3GPP NR system, the UE may transmit controlinformation such as HARQ-ACK and CSI described above through the PUSCHand/or PUCCH.

FIG. 4 illustrates an SS/PBCH block for initial cell access in a 3GPP NRsystem.

When the power is turned on or wanting to access a new cell, the UE mayobtain time and frequency synchronization with the cell and perform aninitial cell search procedure. The UE may detect a physical cellidentity N^(cell) _(ID) of the cell during a cell search procedure. Forthis, the UE may receive a synchronization signal, for example, aprimary synchronization signal (PSS) and a secondary synchronizationsignal (SSS), from a base station, and synchronize with the basestation. In this case, the UE can obtain information such as a cellidentity (ID).

Referring to FIG. 4A, a synchronization signal (SS) will be described inmore detail. The synchronization signal can be classified into PSS andSSS. The PSS may be used to obtain time domain synchronization and/orfrequency domain synchronization, such as OFDM symbol synchronizationand slot synchronization. The SSS can be used to obtain framesynchronization and cell group ID. Referring to FIG. 4A and Table 2, theSS/PBCH block can be configured with consecutive 20 RBs (=240subcarriers) in the frequency axis, and can be configured withconsecutive 4 OFDM symbols in the time axis. In this case, in theSS/PBCH block, the PSS is transmitted in the first OFDM symbol and theSSS is transmitted in the third OFDM symbol through the 56th to 182thsubcarriers. Here, the lowest subcarrier index of the SS/PBCH block isnumbered from 0. In the first OFDM symbol in which the PSS istransmitted, the base station does not transmit a signal through theremaining subcarriers, i.e., 0th to 55th and 183th to 239th subcarriers.In addition, in the third OFDM symbol in which the SSS is transmitted,the base station does not transmit a signal through 48th to 55th and183th to 191th subcarriers. The base station transmits a physicalbroadcast channel (PBCH) through the remaining RE except for the abovesignal in the SS/PBCH block.

TABLE 2 OFDM symbol number/ Subcarrier number k Channel relative to thestart of relative to the start of or signal an SS/PBCH block an SS/PBCHblock PSS 0 56, 57, . . . ,182 SSS 2 56, 57 182 Set to 0 0 0, 1, . . . ,55, 183, 184, . . . , 239 2 48, 49, . . . , 55, 183, 184, . . . , 191PBCH 1, 3 0, 1, . . . , 239 2 0, 1, . . . , 47, 192, 193, . . . , 239DM-RS 1, 3 0 + v, 4 + v, 8 + v, . . . , 236 + v for 2 0+v, 4 + v, 8 + v,. . . , 44 + v PBCH 192 + v, 196 +v, . . . , 236 + v

The SS allows a total of 1008 unique physical layer cell IDs to begrouped into 336 physical-layer cell-identifier groups, each groupincluding three unique identifiers, through a combination of three PSSsand SSSs, specifically, such that each physical layer cell ID is to beonly a part of one physical-layer cell-identifier group. Therefore, thephysical layer cell ID N^(cell) _(ID)=3N⁽¹⁾ _(ID)+N⁽²⁾ _(ID) can beuniquely defined by the index N⁽¹⁾ _(ID) ranging from 0 to 335indicating a physical-layer cell-identifier group and the index N⁽²⁾_(ID) ranging from 0 to 2 indicating a physical-layer identifier in thephysical-layer cell-identifier group. The UE may detect the PSS andidentify one of the three unique physical-layer identifiers. Inaddition, the UE can detect the SSS and identify one of the 336 physicallayer cell IDs associated with the physical-layer identifier. In thiscase, the sequence d_(PSS)(n) of the PSS is as follows.

d _(PPS)(n)=1−2x(m)

m=(n+43N _(ID) ⁽²⁾mod 127

0≤n<127

Here, x(i+7)=(x(i+4)+x(i)) mod 2 and is given as

[x(6)x(5)x(4)x(3)x(2)x(1)x(0)]=[11 10 11 0]

Further, the sequence d_(SSS)(n) of the SSS is as follows.

$\begin{matrix}{{d_{SSS}(n)} = \left\lbrack {1 - {2{x_{0}\left( {\left( {n + m_{0}} \right){mod}\ 127} \right)}I1} - {2{x_{1}\left( {\left( {n + m_{1}} \right){mod}127} \right)}}} \right\rbrack} \\{m_{0} = {{15\left\lfloor \frac{N_{ID}^{(1)}}{112} \right\rfloor} + {5N_{ID}^{(2)}}}} \\{m_{1} = {N_{ID}^{(1)}{mod}\ 112}} \\{0 \leq n < {127}}\end{matrix}$

Here,

x ₀(i+7)=(x ₀(i+4)+x ₀(i))mod 2

x ₁(i+7)=(x ₁(i+1)+x ₁(i))mod 2

and is given as

[x ₀(6)x ₀(5)x ₀(4)x ₀(3)x ₀(2)x ₀(1)x ₀(0)]=[00 00 00 1]

[x ₁(6)x ₁(5)x ₁(4)x ₁(3)x ₁(2)x ₁(1)x ₁(0)]=[00 00 00 1]

A radio frame with a 10 ms length may be divided into two half frameswith a 5 ms length. Referring to FIG. 4B, a description will be made ofa slot in which SS/PBCH blocks are transmitted in each half frame. Aslot in which the SS/PBCH block is transmitted may be any one of thecases A, B, C, D, and E. In the case A, the subcarrier spacing is 15 kHzand the starting time point of the SS/PBCH block is the ({2, 8}+14*n)-thsymbol. In this case, n=0 or 1 at a carrier frequency of 3 GHz or less.In addition, it may be n=0, 1, 2, 3 at carrier frequencies above 3 GHzand below 6 GHz. In the case B, the subcarrier spacing is 30 kHz and thestarting time point of the SS/PBCH block is {4, 8, 16, 20}+28*n. In thiscase, n=0 at a carrier frequency of 3 GHz or less. In addition, it maybe n=0, 1 at carrier frequencies above 3 GHz and below 6 GHz. In thecase C, the subcarrier spacing is 30 kHz and the starting time point ofthe SS/PBCH block is the ({2, 8}+14*n)-th symbol. In this case, n=0 or 1at a carrier frequency of 3 GHz or less. In addition, it may be n=0, 1,2, 3 at carrier frequencies above 3 GHz and below 6 GHz. In the case D,the subcarrier spacing is 120 kHz and the starting time point of theSS/PBCH block is the ({4, 8, 16, 20}+28*n)-th symbol. In this case, at acarrier frequency of 6 GHz or more, n=0, 1, 2, 3, 5, 6, 7, 8, 10, 11,12, 13, 15, 16, 17, 18. In the case E, the subcarrier spacing is 240 kHzand the starting time point of the SS/PBCH block is the ({8, 12, 16, 20,32, 36, 40, 44}+56*n)-th symbol. In this case, at a carrier frequency of6 GHz or more, n=0, 1, 2, 3, 5, 6, 7, 8.

FIG. 5 illustrates a procedure for transmitting control information anda control channel in a 3GPP NR system. Referring to FIG. 5A, the basestation may add a cyclic redundancy check (CRC) masked (e.g., an XORoperation) with a radio network temporary identifier (RNTI) to controlinformation (e.g., downlink control information (DCI)) (S202). The basestation may scramble the CRC with an RNTI value determined according tothe purpose/target of each control information. The common RNTI used byone or more UEs can include at least one of a system information RNTI(SI-RNTI), a paging RNTI (P-RNTI), a random access RNTI (RA-RNTI), and atransmit power control RNTI (TPC-RNTI). In addition, the UE-specificRNTI may include at least one of a cell temporary RNTI (C-RNTI), and theCS-RNTI. Thereafter, the base station may perform rate-matching (S206)according to the amount of resource(s) used for PDCCH transmission afterperforming channel encoding (e.g., polar coding) (S204). Thereafter, thebase station may multiplex the DCI(s) based on the control channelelement (CCE) based PDCCH structure (S208). In addition, the basestation may apply an additional process (S210) such as scrambling,modulation (e.g., QPSK), interleaving, and the like to the multiplexedDCI(s), and then map the DCI(s) to the resource to be transmitted. TheCCE is a basic resource unit for the PDCCH, and one CCE may include aplurality (e.g., six) of resource element groups (REGs). One REG may beconfigured with a plurality (e.g., 12) of REs. The number of CCEs usedfor one PDCCH may be defined as an aggregation level. In the 3GPP NRsystem, an aggregation level of 1, 2, 4, 8, or 16 may be used. FIG. 5Bis a diagram related to a CCE aggregation level and the multiplexing ofa PDCCH and illustrates the type of a CCE aggregation level used for onePDCCH and CCE(s) transmitted in the control area according thereto.

FIG. 6 illustrates a control resource set (CORESET) in which a physicaldownlink control channel (PUCCH) may be transmitted in a 3GPP NR system.

The CORESET is a time-frequency resource in which PDCCH, that is, acontrol signal for the UE, is transmitted. In addition, a search spaceto be described later may be mapped to one CORESET. Therefore, the UEmay monitor the time-frequency domain designated as CORESET instead ofmonitoring all frequency bands for PDCCH reception, and decode the PDCCHmapped to CORESET. The base station may configure one or more CORESETsfor each cell to the UE. The CORESET may be configured with up to threeconsecutive symbols on the time axis. In addition, the CORESET may beconfigured in units of six consecutive PRBs on the frequency axis. Inthe embodiment of FIG. 5 , CORESET #1 is configured with consecutivePRBs, and CORESET #2 and CORESET #3 are configured with discontinuousPRBs. The CORESET can be located in any symbol in the slot. For example,in the embodiment of FIG. 5 , CORESET #1 starts at the first symbol ofthe slot, CORESET #2 starts at the fifth symbol of the slot, and CORESET#9 starts at the ninth symbol of the slot.

FIG. 7 illustrates a method for setting a PUCCH search space in a 3GPPNR system.

In order to transmit the PDCCH to the UE, each CORESET may have at leastone search space. In the embodiment of the present disclosure, thesearch space is a set of all time-frequency resources (hereinafter,PDCCH candidates) through which the PDCCH of the UE is capable of beingtransmitted. The search space may include a common search space that theUE of the 3GPP NR is required to commonly search and a UE-specific or aUE-specific search space that a specific UE is required to search. Inthe common search space, UE may monitor the PDCCH that is set so thatall UEs in the cell belonging to the same base station commonly search.In addition, the UE-specific search space may be set for each UE so thatUEs monitor the PDCCH allocated to each UE at different search spaceposition according to the UE. In the case of the UE-specific searchspace, the search space between the UEs may be partially overlapped andallocated due to the limited control area in which the PDCCH may beallocated. Monitoring the PDCCH includes blind decoding for PDCCHcandidates in the search space. When the blind decoding is successful,it may be expressed that the PDCCH is (successfully) detected/receivedand when the blind decoding fails, it may be expressed that the PDCCH isnot detected/not received, or is not successfully detected/received.

For convenience of explanation, a PDCCH scrambled with a group common(GC) RNTI previously known to one or more UEs so as to transmit DLcontrol information to the one or more UEs is referred to as a groupcommon (GC) PDCCH or a common PDCCH. In addition, a PDCCH scrambled witha specific-terminal RNTI that a specific UE already knows so as totransmit UL scheduling information or DL scheduling information to thespecific UE is referred to as a specific-UE PDCCH. The common PDCCH maybe included in a common search space, and the UE-specific PDCCH may beincluded in a common search space or a UE-specific PDCCH.

The base station may signal each UE or UE group through a PDCCH aboutinformation (i.e., DL Grant) related to resource allocation of a pagingchannel (PCH) and a downlink-shared channel (DL-SCH) that are atransmission channel or information (i.e., UL grant) related to resourceallocation of a uplink-shared channel (UL-SCH) and a hybrid automaticrepeat request (HARD). The base station may transmit the PCH transportblock and the DL-SCH transport block through the PDSCH. The base stationmay transmit data excluding specific control information or specificservice data through the PDSCH. In addition, the UE may receive dataexcluding specific control information or specific service data throughthe PDSCH.

The base station may include, in the PDCCH, information on to which UE(one or a plurality of UEs) PDSCH data is transmitted and how the PDSCHdata is to be received and decoded by the corresponding UE, and transmitthe PDCCH. For example, it is assumed that the DCI transmitted on aspecific PDCCH is CRC masked with an RNTI of “A”, and the DCI indicatesthat PDSCH is allocated to a radio resource (e.g., frequency location)of “B” and indicates transmission format information (e.g., transportblock size, modulation scheme, coding information, etc.) of “C”. The UEmonitors the PDCCH using the RNTI information that the UE has. In thiscase, if there is a UE which performs blind decoding the PDCCH using the“A” RNTI, the UE receives the PDCCH, and receives the PDSCH indicated by“B” and “C” through the received PDCCH information.

Table 3 shows an embodiment of a physical uplink control channel (PUCCH)used in a wireless communication system.

TABLE 3 PUCCH format Length in OFDM symbols Number of bits 0 1-2 ≤2 1 4-14 ≤2 2 1-2 >2 3  4-14 >2 4  4-14 >2

The PUCCH may be used to transmit the following UL control information(UCI).

-   -   Scheduling Request (SR): Information used for requesting a UL        UL-SCH resource.    -   HARQ-ACK: A Response to PDCCH (indicating DL SPS release) and/or        a response to DL transport block (TB) on PDSCH. HARQ-ACK        indicates whether information transmitted on the PDCCH or PDSCH        is received. The HARQ-ACK response includes positive ACK (simply        ACK), negative ACK (hereinafter NACK), Discontinuous        Transmission (DTX), or NACK/DTX. Here, the term HARQ-ACK is used        mixed with HARQ-ACK/NACK and ACK/NACK. In general, ACK may be        represented by bit value 1 and NACK may be represented by bit        value 0.    -   Channel State Information (CSI): Feedback information on the DL        channel. The UE generates it based on the CSI-Reference Signal        (RS) transmitted by the base station. Multiple Input Multiple        Output (MIMO)-related feedback information includes a Rank        Indicator (RI) and a Precoding Matrix Indicator (PMI). CSI can        be divided into CSI part 1 and CSI part 2 according to the        information indicated by CSI.

In the 3GPP NR system, five PUCCH formats may be used to support variousservice scenarios, various channel environments, and frame structures.

PUCCH format 0 is a format capable of delivering 1-bit or 2-bit HARQ-ACKinformation or SR. PUCCH format 0 can be transmitted through one or twoOFDM symbols on the time axis and one PRB on the frequency axis. WhenPUCCH format 0 is transmitted in two OFDM symbols, the same sequence onthe two symbols may be transmitted through different RBs. In this case,the sequence may be a sequence cyclic shifted (CS) from a base sequenceused in PUCCH format 0. Through this, the UE may obtain a frequencydiversity gain. In more detail, the UE may determine a cyclic shift (CS)value m_(cs) according to M_(bit) bit UCI (M_(bit)=1 or 2). In addition,the base sequence having the length of 12 may be transmitted by mappinga cyclic shifted sequence based on a predetermined CS value m_(cs) toone OFDM symbol and 12 REs of one RB. When the number of cyclic shiftsavailable to the UE is 12 and M_(bit)=1, 1 bit UCI 0 and 1 may be mappedto two cyclic shifted sequences having a difference of 6 in the cyclicshift value, respectively. In addition, when M_(bit)=2, 2 bit UCI 00,01, 11, and 10 may be mapped to four cyclic shifted sequences having adifference of 3 in cyclic shift values, respectively.

PUCCH format 1 may deliver 1-bit or 2-bit HARQ-ACK information or SR.PUCCH format 1 may be transmitted through consecutive OFDM symbols onthe time axis and one PRB on the frequency axis. Here, the number ofOFDM symbols occupied by PUCCH format 1 may be one of 4 to 14. Morespecifically, UCI, which is M_(bit)=1, may be BPSK-modulated. The UE maymodulate UCI, which is M_(bit)=2, with quadrature phase shift keying(QPSK). A signal is obtained by multiplying a modulated complex valuedsymbol d(0) by a sequence of length 12. In this case, the sequence maybe a base sequence used for PUCCH format 0. The UE spreads theeven-numbered OFDM symbols to which PUCCH format 1 is allocated throughthe time axis orthogonal cover code (OCC) to transmit the obtainedsignal. PUCCH format 1 determines the maximum number of different UEsmultiplexed in the one RB according to the length of the OCC to be used.A demodulation reference signal (DMRS) may be spread with OCC and mappedto the odd-numbered OFDM symbols of PUCCH format 1.

PUCCH format 2 may deliver UCI exceeding 2 bits. PUCCH format 2 may betransmitted through one or two OFDM symbols on the time axis and one ora plurality of RBs on the frequency axis. When PUCCH format 2 istransmitted in two OFDM symbols, the sequences which are transmitted indifferent RBs through the two OFDM symbols may be same each other. Here,the sequence may be a plurality of modulated complex valued symbolsd(0), . . . , d(M_(symbol)−1). Here, M_(symbol) may be M_(bit)/2.Through this, the UE may obtain a frequency diversity gain. Morespecifically, M_(bit) bit UCI (M_(bit)>2) is bit-level scrambled, QPSKmodulated, and mapped to RB(s) of one or two OFDM symbol(s). Here, thenumber of RBs may be one of 1 to 16.

PUCCH format 3 or PUCCH format 4 may deliver UCI exceeding 2 bits. PUCCHformat 3 or PUCCH format 4 may be transmitted through consecutive OFDMsymbols on the time axis and one PRB on the frequency axis. The numberof OFDM symbols occupied by PUCCH format 3 or PUCCH format 4 may be oneof 4 to 14. Specifically, the UE modulates M_(bit) bits UCI (Mbit>2)with η/2-Binary Phase Shift Keying (BPSK) or QPSK to generate a complexvalued symbol d(0) to d(M_(symb)−1). Here, when using η/2-BPSK,M_(symb)=M_(bit), and when using QPSK, M_(symb)=M_(bit)/2. The UE maynot apply block-unit spreading to the PUCCH format 3. However, the UEmay apply block-unit spreading to one RB (i.e., 12 subcarriers) usingPreDFT-OCC of a length of 12 such that PUCCH format 4 may have two orfour multiplexing capacities. The UE performs transmit precoding (orDFT-precoding) on the spread signal and maps it to each RE to transmitthe spread signal.

In this case, the number of RBs occupied by PUCCH format 2, PUCCH format3, or PUCCH format 4 may be determined according to the length andmaximum code rate of the UCI transmitted by the UE. When the UE usesPUCCH format 2, the UE may transmit HARQ-ACK information and CSIinformation together through the PUCCH. When the number of RBs that theUE may transmit is greater than the maximum number of RBs that PUCCHformat 2, or PUCCH format 3, or PUCCH format 4 may use, the UE maytransmit only the remaining UCI information without transmitting someUCI information according to the priority of the UCI information.

PUCCH format 1, PUCCH format 3, or PUCCH format 4 may be configuredthrough the RRC signal to indicate frequency hopping in a slot. Whenfrequency hopping is configured, the index of the RB to be frequencyhopped may be configured with an RRC signal. When PUCCH format 1, PUCCHformat 3, or PUCCH format 4 is transmitted through N OFDM symbols on thetime axis, the first hop may have floor (N/2) OFDM symbols and thesecond hop may have ceiling(N/2) OFDM symbols.

PUCCH format 1, PUCCH format 3, or PUCCH format 4 may be configured tobe repeatedly transmitted in a plurality of slots. In this case, thenumber K of slots in which the PUCCH is repeatedly transmitted may beconfigured by the RRC signal. The repeatedly transmitted PUCCHs muststart at an OFDM symbol of the constant position in each slot, and havethe constant length. When one OFDM symbol among OFDM symbols of a slotin which a UE should transmit a PUCCH is indicated as a DL symbol by anRRC signal, the UE may not transmit the PUCCH in a corresponding slotand delay the transmission of the PUCCH to the next slot to transmit thePUCCH.

Meanwhile, in the 3GPP NR system, a UE may performtransmission/reception using a bandwidth equal to or less than thebandwidth of a carrier (or cell). For this, the UE may receive theBandwidth part (BWP) configured with a continuous bandwidth of some ofthe carrier's bandwidth. A UE operating according to TDD or operating inan unpaired spectrum can receive up to four DL/UL BWP pairs in onecarrier (or cell). In addition, the UE may activate one DL/UL BWP pair.A UE operating according to FDD or operating in paired spectrum canreceive up to four DL BWPs on a DL carrier (or cell) and up to four ULBWPs on a UL carrier (or cell). The UE may activate one DL BWP and oneUL BWP for each carrier (or cell). The UE may not perform reception ortransmission in a time-frequency resource other than the activated BWP.The activated BWP may be referred to as an active BWP.

The base station may indicate the activated BWP among the BWPsconfigured by the UE through downlink control information (DCI). The BWPindicated through the DCI is activated and the other configured BWP(s)are deactivated. In a carrier (or cell) operating in TDD, the basestation may include, in the DCI for scheduling PDSCH or PUSCH, abandwidth part indicator (BPI) indicating the BWP to be activated tochange the DL/UL BWP pair of the UE. The UE may receive the DCI forscheduling the PDSCH or PUSCH and may identify the DL/UL BWP pairactivated based on the BPI. For a DL carrier (or cell) operating in anFDD, the base station may include a BPI indicating the BWP to beactivated in the DCI for scheduling PDSCH so as to change the DL BWP ofthe UE. For a UL carrier (or cell) operating in an FDD, the base stationmay include a BPI indicating the BWP to be activated in the DCI forscheduling PUSCH so as to change the UL BWP of the UE.

FIG. 8 is a conceptual diagram illustrating carrier aggregation.

The carrier aggregation is a method in which the UE uses a plurality offrequency blocks or cells (in the logical sense) configured with ULresources (or component carriers) and/or DL resources (or componentcarriers) as one large logical frequency band in order for a wirelesscommunication system to use a wider frequency band. One componentcarrier may also be referred to as a term called a Primary cell (PCell)or a Secondary cell (SCell), or a Primary SCell (PScell). However,hereinafter, for convenience of description, the term “componentcarrier” is used.

Referring to FIG. 8 , as an example of a 3GPP NR system, the entiresystem band may include up to 16 component carriers, and each componentcarrier may have a bandwidth of up to 400 MHz. The component carrier mayinclude one or more physically consecutive subcarriers. Although it isshown in FIG. 8 that each of the component carriers has the samebandwidth, this is merely an example, and each component carrier mayhave a different bandwidth. Also, although each component carrier isshown as being adjacent to each other in the frequency axis, thedrawings are shown in a logical concept, and each component carrier maybe physically adjacent to one another, or may be spaced apart.

Different center frequencies may be used for each component carrier.Also, one common center frequency may be used in physically adjacentcomponent carriers. Assuming that all the component carriers arephysically adjacent in the embodiment of FIG. 8 , center frequency A maybe used in all the component carriers. Further, assuming that therespective component carriers are not physically adjacent to each other,center frequency A and the center frequency B can be used in each of thecomponent carriers.

When the total system band is extended by carrier aggregation, thefrequency band used for communication with each UE can be defined inunits of a component carrier. UE A may use 100 MHz, which is the totalsystem band, and performs communication using all five componentcarriers. UEs B₁˜B₅ can use only a 20 MHz bandwidth and performcommunication using one component carrier. UEs C₁ and C₂ may use a 40MHz bandwidth and perform communication using two component carriers,respectively. The two component carriers may be logically/physicallyadjacent or non-adjacent. UE C₁ represents the case of using twonon-adjacent component carriers, and UE C₂ represents the case of usingtwo adjacent component carriers.

FIG. 9 is a drawing for explaining signal carrier communication andmultiple carrier communication. Particularly, FIG. 9A shows a singlecarrier subframe structure and FIG. 9B shows a multi-carrier subframestructure.

Referring to FIG. 9A, in an FDD mode, a general wireless communicationsystem may perform data transmission or reception through one DL bandand one UL band corresponding thereto. In another specific embodiment,in a TDD mode, the wireless communication system may divide a radioframe into a UL time unit and a DL time unit in a time domain, andperform data transmission or reception through a UL/DL time unit.Referring to FIG. 9B, three 20 MHz component carriers (CCs) can beaggregated into each of UL and DL, so that a bandwidth of 60 MHz can besupported. Each CC may be adjacent or non-adjacent to one another in thefrequency domain. FIG. 9B shows a case where the bandwidth of the UL CCand the bandwidth of the DL CC are the same and symmetric, but thebandwidth of each CC can be determined independently. In addition,asymmetric carrier aggregation with different number of UL CCs and DLCCs is possible. A DL/UL CC allocated/configured to a specific UEthrough RRC may be called as a serving DL/UL CC of the specific UE.

The base station may perform communication with the UE by activatingsome or all of the serving CCs of the UE or deactivating some CCs. Thebase station can change the CC to be activated/deactivated, and changethe number of CCs to be activated/deactivated. If the base stationallocates a CC available for the UE as to be cell-specific orUE-specific, at least one of the allocated CCs can be deactivated,unless the CC allocation for the UE is completely reconfigured or the UEis handed over. One CC that is not deactivated by the UE is called as aPrimary CC (PCC) or a primary cell (PCell), and a CC that the basestation can freely activate/deactivate is called as a Secondary CC (SCC)or a secondary cell (SCell).

Meanwhile, 3GPP NR uses the concept of a cell to manage radio resources.A cell is defined as a combination of DL resources and UL resources,that is, a combination of DL CC and UL CC. A cell may be configured withDL resources alone, or a combination of DL resources and UL resources.When the carrier aggregation is supported, the linkage between thecarrier frequency of the DL resource (or DL CC) and the carrierfrequency of the UL resource (or UL CC) may be indicated by systeminformation. The carrier frequency refers to the center frequency ofeach cell or CC. A cell corresponding to the PCC is referred to as aPCell, and a cell corresponding to the SCC is referred to as an SCell.The carrier corresponding to the PCell in the DL is the DL PCC, and thecarrier corresponding to the PCell in the UL is the UL PCC. Similarly,the carrier corresponding to the SCell in the DL is the DL SCC and thecarrier corresponding to the SCell in the UL is the UL SCC. According toUE capability, the serving cell(s) may be configured with one PCell andzero or more SCells. In the case of UEs that are in the RRC CONNECTEDstate but not configured for carrier aggregation or that do not supportcarrier aggregation, there is only one serving cell configured only withPCell.

As mentioned above, the term “cell” used in carrier aggregation isdistinguished from the term “cell” which refers to a certaingeographical area in which a communication service is provided by onebase station or one antenna group. That is, one component carrier mayalso be referred to as a scheduling cell, a scheduled cell, a primarycell (PCell), a secondary cell (SCell), or a primary SCell (PScell).However, in order to distinguish between a cell referring to a certaingeographical area and a cell of carrier aggregation, in the presentdisclosure, a cell of a carrier aggregation is referred to as a CC, anda cell of a geographical area is referred to as a cell.

FIG. 10 is a diagram showing an example in which a cross carrierscheduling technique is applied. When cross carrier scheduling is set,the control channel transmitted through the first CC may schedule a datachannel transmitted through the first CC or the second CC using acarrier indicator field (CIF). The CIF is included in the DCI. In otherwords, a scheduling cell is set, and the DL grant/UL grant transmittedin the PDCCH area of the scheduling cell schedules the PDSCH/PUSCH ofthe scheduled cell. That is, a search area for the plurality ofcomponent carriers exists in the PDCCH area of the scheduling cell. APCell may be basically a scheduling cell, and a specific SCell may bedesignated as a scheduling cell by an upper layer.

In the embodiment of FIG. 10 , it is assumed that three DL CCs aremerged. Here, it is assumed that DL component carrier #0 is DL PCC (orPCell), and DL component carrier #1 and DL component carrier #2 are DLSCCs (or SCell). In addition, it is assumed that the DL PCC is set tothe PDCCH monitoring CC. When cross-carrier scheduling is not configuredby UE-specific (or UE-group-specific or cell-specific) higher layersignaling, a CIF is disabled, and each DL CC can transmit only a PDCCHfor scheduling its PDSCH without the CIF according to an NR PDCCH rule(non-cross-carrier scheduling, self-carrier scheduling). Meanwhile, ifcross-carrier scheduling is configured by UE-specific (orUE-group-specific or cell-specific) higher layer signaling, a CIF isenabled, and a specific CC (e.g., DL PCC) may transmit not only thePDCCH for scheduling the PDSCH of the DL CC A using the CIF but also thePDCCH for scheduling the PDSCH of another CC (cross-carrier scheduling).On the other hand, a PDCCH is not transmitted in another DL CC.Accordingly, the UE monitors the PDCCH not including the CIF to receivea self-carrier scheduled PDSCH depending on whether the cross-carrierscheduling is configured for the UE, or monitors the PDCCH including theCIF to receive the cross-carrier scheduled PDSCH.

On the other hand, FIGS. 9 and 10 illustrate the subframe structure ofthe 3GPP LTE-A system, and the same or similar configuration may beapplied to the 3GPP NR system. However, in the 3GPP NR system, thesubframes of FIGS. 9 and 10 may be replaced with slots.

FIG. 11 is a block diagram showing the configurations of a UE and a basestation according to an embodiment of the present disclosure. In anembodiment of the present disclosure, the UE may be implemented withvarious types of wireless communication devices or computing devicesthat are guaranteed to be portable and mobile. The UE may be referred toas a User Equipment (UE), a Station (STA), a Mobile Subscriber (MS), orthe like. In addition, in an embodiment of the present disclosure, thebase station controls and manages a cell (e.g., a macro cell, a femtocell, a pico cell, etc.) corresponding to a service area, and performsfunctions of a signal transmission, a channel designation, a channelmonitoring, a self diagnosis, a relay, or the like. The base station maybe referred to as next Generation NodeB (gNB) or Access Point (AP).

As shown in the drawing, a UE 100 according to an embodiment of thepresent disclosure may include a processor 110, a communication module120, a memory 130, a user interface 140, and a display unit 150.

First, the processor 110 may execute various instructions or programsand process data within the UE 100. In addition, the processor 110 maycontrol the entire operation including each unit of the UE 100, and maycontrol the transmission/reception of data between the units. Here, theprocessor 110 may be configured to perform an operation according to theembodiments described in the present disclosure. For example, theprocessor 110 may receive slot configuration information, determine aslot configuration based on the slot configuration information, andperform communication according to the determined slot configuration.

Next, the communication module 120 may be an integrated module thatperforms wireless communication using a wireless communication networkand a wireless LAN access using a wireless LAN. For this, thecommunication module 120 may include a plurality of network interfacecards (NICs) such as cellular communication interface cards 121 and 122and an unlicensed band communication interface card 123 in an internalor external form. In the drawing, the communication module 120 is shownas an integral integration module, but unlike the drawing, each networkinterface card can be independently arranged according to a circuitconfiguration or usage.

The cellular communication interface card 121 may transmit or receive aradio signal with at least one of the base station 200, an externaldevice, and a server by using a mobile communication network and providea cellular communication service in a first frequency band based on theinstructions from the processor 110. According to an embodiment, thecellular communication interface card 121 may include at least one NICmodule using a frequency band of less than 6 GHz. At least one NICmodule of the cellular communication interface card 121 mayindependently perform cellular communication with at least one of thebase station 200, an external device, and a server in accordance withcellular communication standards or protocols in the frequency bandsbelow 6 GHz supported by the corresponding NIC module.

The cellular communication interface card 122 may transmit or receive aradio signal with at least one of the base station 200, an externaldevice, and a server by using a mobile communication network and providea cellular communication service in a second frequency band based on theinstructions from the processor 110. According to an embodiment, thecellular communication interface card 122 may include at least one NICmodule using a frequency band of more than 6 GHz. At least one NICmodule of the cellular communication interface card 122 mayindependently perform cellular communication with at least one of thebase station 200, an external device, and a server in accordance withcellular communication standards or protocols in the frequency bands of6 GHz or more supported by the corresponding NIC module.

The unlicensed band communication interface card 123 transmits orreceives a radio signal with at least one of the base station 200, anexternal device, and a server by using a third frequency band which isan unlicensed band, and provides an unlicensed band communicationservice based on the instructions from the processor 110. The unlicensedband communication interface card 123 may include at least one NICmodule using an unlicensed band. For example, the unlicensed band may bea band of 2.4 GHz or 5 GHz. At least one NIC module of the unlicensedband communication interface card 123 may independently or dependentlyperform wireless communication with at least one of the base station200, an external device, and a server according to the unlicensed bandcommunication standard or protocol of the frequency band supported bythe corresponding NIC module.

The memory 130 stores a control program used in the UE 100 and variouskinds of data therefor. Such a control program may include a prescribedprogram required for performing wireless communication with at least oneamong the base station 200, an external device, and a server.

Next, the user interface 140 includes various kinds of input/outputmeans provided in the UE 100. In other words, the user interface 140 mayreceive a user input using various input means, and the processor 110may control the UE 100 based on the received user input. In addition,the user interface 140 may perform an output based on instructions fromthe processor 110 using various kinds of output means.

Next, the display unit 150 outputs various images on a display screen.The display unit 150 may output various display objects such as contentexecuted by the processor 110 or a user interface based on controlinstructions from the processor 110.

In addition, the base station 200 according to an embodiment of thepresent disclosure may include a processor 210, a communication module220, and a memory 230.

First, the processor 210 may execute various instructions or programs,and process internal data of the base station 200. In addition, theprocessor 210 may control the entire operations of units in the basestation 200, and control data transmission and reception between theunits. Here, the processor 210 may be configured to perform operationsaccording to embodiments described in the present disclosure. Forexample, the processor 210 may signal slot configuration and performcommunication according to the signaled slot configuration.

Next, the communication module 220 may be an integrated module thatperforms wireless communication using a wireless communication networkand a wireless LAN access using a wireless LAN. For this, thecommunication module 120 may include a plurality of network interfacecards such as cellular communication interface cards 221 and 222 and anunlicensed band communication interface card 223 in an internal orexternal form. In the drawing, the communication module 220 is shown asan integral integration module, but unlike the drawing, each networkinterface card can be independently arranged according to a circuitconfiguration or usage.

The cellular communication interface card 221 may transmit or receive aradio signal with at least one of the base station 100, an externaldevice, and a server by using a mobile communication network and providea cellular communication service in the first frequency band based onthe instructions from the processor 210. According to an embodiment, thecellular communication interface card 221 may include at least one NICmodule using a frequency band of less than 6 GHz. The at least one NICmodule of the cellular communication interface card 221 mayindependently perform cellular communication with at least one of thebase station 100, an external device, and a server in accordance withthe cellular communication standards or protocols in the frequency bandsless than 6 GHz supported by the corresponding NIC module.

The cellular communication interface card 222 may transmit or receive aradio signal with at least one of the base station 100, an externaldevice, and a server by using a mobile communication network and providea cellular communication service in the second frequency band based onthe instructions from the processor 210. According to an embodiment, thecellular communication interface card 222 may include at least one NICmodule using a frequency band of 6 GHz or more. The at least one NICmodule of the cellular communication interface card 222 mayindependently perform cellular communication with at least one of thebase station 100, an external device, and a server in accordance withthe cellular communication standards or protocols in the frequency bands6 GHz or more supported by the corresponding NIC module.

The unlicensed band communication interface card 223 transmits orreceives a radio signal with at least one of the base station 100, anexternal device, and a server by using the third frequency band which isan unlicensed band, and provides an unlicensed band communicationservice based on the instructions from the processor 210. The unlicensedband communication interface card 223 may include at least one NICmodule using an unlicensed band. For example, the unlicensed band may bea band of 2.4 GHz or 5 GHz. At least one NIC module of the unlicensedband communication interface card 223 may independently or dependentlyperform wireless communication with at least one of the base station100, an external device, and a server according to the unlicensed bandcommunication standards or protocols of the frequency band supported bythe corresponding NIC module.

FIG. 11 is a block diagram illustrating the UE 100 and the base station200 according to an embodiment of the present disclosure, and blocksseparately shown are logically divided elements of a device.Accordingly, the aforementioned elements of the device may be mounted ina single chip or a plurality of chips according to the design of thedevice. In addition, a part of the configuration of the UE 100, forexample, a user interface 140, a display unit 150 and the like may beselectively provided in the UE 100. In addition, the user interface 140,the display unit 150 and the like may be additionally provided in thebase station 200, if necessary.

The base station may schedule a time-frequency resource scheduled fortransmission of a physical uplink data channel of a UE to anotherphysical uplink channel or a physical uplink channel transmission ofanother UE. In addition, the base station may schedule a time-frequencyresource scheduled for physical uplink transmission of any one UE toother types of physical uplink transmission to be transmitted to thecorresponding UE. Scheduling the time-frequency resource, which isscheduled for a specific purpose, for other purpose in such a way iscalled a preemption. When a time-frequency resource scheduled forphysical uplink transmission of one UE is preempted for physical uplinktransmission of another UE, the base station may transmit an uplink (UL)preemption indicator indicating the preempted time-frequency resourceamong the time-frequency resources scheduled for uplink transmission ofthe UE to the UE. Here, the physical uplink channel may include aphysical uplink data channel or a physical uplink control channel.Preemption indicators will be described with reference to FIGS. 12 to 15.

FIG. 12 shows a preemption indicator used in a wireless communicationsystem according to an embodiment of the present invention.

The base station may configure the UE to receive the UL preemptionindicator using the RRC signal. The base station may transmit the ULpreemption indicator to the UE through PDCCH. When the UE is configuredto receive the UL preemption indicator through the RRC signal, the UEmay receive the UL preemption indicator through the PDCCH. The UE mayobtain at least one of a search space for the UL preemption indicator, amonitoring cycle of the UL preemption indicator, a value of the RNTI,and a length of the RNTI through the RRC signal. The UE may monitor theUL preemption indicator according to the monitoring cycle of theobtained UL preemption indicator. In addition, the UE may monitor the ULpreemption indicator in the search space for the obtained UL preemptionindicator. In addition, the UE may blindly decode the scrambled DCIaccording to the obtained RNTI value and the length of the RNTI. Whenthe UE obtains the DCI scrambled with the value of the RNTI obtained,the UE may determine the DCI as a UL preemption indicator. The basestation may configure one UL preemption indicator configuration to aplurality of UEs using the RRC signal. In this case, the PDCCHtransmitting the UL preemption indicator is a group common PDCCH. Thebase station may configure the UL preemption indicator to one UE usingthe RRC signal. In this case, the PDCCH transmitting the UL preemptionindicator is a UE-specific PDCCH.

The time-frequency resource in which the UL preemption indicatorindicates whether to preempt may include all PRBs of the UL BWP. Forconvenience of description, a time-frequency resource in which the ULpreemption indicator indicates whether to preempt is referred to as areference UL time-frequency resource. When the monitoring period of theUL preemption indicator is T_(INT), the reference UL time time-frequencyresource may be as shown in the following equation.

{mT _(INT)+1+Δ_(offset) ,mT _(INT)+2+Δ_(offset), . . . ,(m+1)T_(INT)−Δ_(offset)}

In this case, Δ_(offset) represents the offset of the time-frequencyresource. Specifically, the offset of the time-frequency resource may beconfigured with the RRC signal. In another specific embodiment, theoffset of the time-frequency resource may be a fixed value. Also, theoffset of the time-frequency resource may be a multiple of the number ofsymbols included in the slot. In addition, the offset of thetime-frequency resource may be determined according to the PUSCHprocessing time of the UE. The minimum time required for the UE toreceive the physical downlink control channel for scheduling thetransmission of the physical uplink data channel and to generate thephysical uplink data channel is referred to as Tproc. The offset of thetime-frequency resource can be determined by a larger number as Tprocincreases. The offset of the time-frequency resource may be a value thatincreases in proportion to the value of Tproc. For example, the offsetof the time-frequency resource may be determined by ceil(Tproc/Symbol_duration). At this time, Symbol_duration is the durationof the OFDM symbol. In addition, ceil(X) represents the smallest integeramong numbers greater than or equal to X. In addition, the UE maydetermine an offset of a time-frequency resource based on timing advance(TA). Specifically, the UE may determine an offset of a time-frequencyresource according to a time difference between a DL frame boundary anda UL frame boundary according to TA.

The base station may perform semi-static DL/UL assignment using acell-specific RRC signal. The semi-static DL/UL assignment may configurea symbol as one of an uplink symbol, a downlink symbol, and a flexiblesymbol. In this case, the uplink symbol is a symbol capable of beingused for uplink transmission, and the downlink symbol is a symbolcapable of being used for downlink transmission. The flexible symbol isa symbol capable of being used for uplink transmission or downlinktransmission depending on a signal. The reference UL time-frequencyresource may not include a downlink symbol configured according to asemi-statict DL/UL assignment. That is, the reference UL time-frequencyresource may include an uplink symbol and a flexible symbol configuredaccording to semi-static DL/UL assignment. In addition, the reference ULtime-frequency resource may not include a flexible symbol locatedimmediately after the downlink symbol. In this case, the number of fullyflexible symbols located immediately after the downlink symbol notincluded in the reference UL time-frequency resource may be one. Inanother specific embodiment, the number of flexible symbols locatedimmediately after a downlink symbol not included in the reference ULtime-frequency resource may be configured by an RRC signal.

The base station may configure reception of a downlink signal using acell-specific RRC signal. The downlink signal may include an SS/PBCHblock. The reference UL time-frequency resource may not include a symbolconfigured to receive the downlink signal. In addition, the reference ULtime-frequency resource may not include a symbol located immediatelyafter a symbol configured to receive the downlink signal. In this case,the number of symbols located immediately after the configured symbolfor receiving the downlink signal that is not included in the referenceUL time-frequency resource may be one. In another specific embodiment,the number of symbols located immediately after the configured symbolfor receiving the downlink signal that is not included in the referenceUL time-frequency resource may be configured by the RRC signal.

The UL preemption indicator may divide the reference UL time-frequencyresource into N parts, and indicate whether each of the N parts ispreempted. In this case, N is a natural number. Specifically, the ULpreemption indicator is a bitmap including N bits, and each of the Nbits may indicate whether each of the N parts of the reference ULresource is preempted. In this case, N is a natural number.Specifically, the UL preemption indicator may be a bitmap having alength of 14 bits. In this case, the UL preemption indicator may dividethe reference UL resource into 14 parts and indicate whether or not eachof the 14 parts is preempted. The 14 parts of the reference ULtime-frequency resource may be divided into 14 parts on the time axis.In another specific embodiment, 14 parts of the reference UL resourcemay be divided into 7 parts on the time axis and 2 parts on thefrequency axis. A method of determining the number of symbols includedin the part of the reference UL time-frequency resource will bedescribed.

The reference UL time-frequency resource may be divided into N parts sothat a difference of the number of symbols included in each part of thereference UL time-frequency resource is at most one. Specifically, whenthe reference UL time-frequency resource includes a total of S symbols,the mod (S, N) parts may include ceil(S/N) symbols, and the N-mod(S, N)parts may include floor (S/N) symbols. mod (X, Y) represents theremainder when X is divided by Y. ceil(X) represents the smallestinteger among numbers greater than or equal to X. floor(X) representsthe largest integer of the same or less than X. It can be expressed asmod(S, N)=S-floor(S/N)*N. In this case, mod (S,N) parts positioned aheadof time may include ceil(S/N) symbols. In addition, in theabove-described embodiments, S and N are each natural numbers.

The UE does not transmit a physical uplink channel in a symbol which isindicated by the UL preemption indicator as being preempted, andtransmits a physical uplink channel in a symbol which is indicated bythe UL preemption indicator as not being preempted. In another specificembodiment, the UE may sequentially transmit the physical uplink channelin a symbol capable of transmitting the physical uplink data channel anddiscard the remaining physical uplink channel. In the embodiment of FIG.12 , the UE is scheduled to transmit physical uplink data channels in 14symbols by the base station. In this case, the UL preemption indicatorindicates that the 5th symbol and the 9th symbol are preempted. The UEmay not transmit REs of physical uplink data channels corresponding tothe 5th and 9th symbols as shown in (a) of FIG. 12 . In this case, theUE may transmit REs of physical uplink data channels corresponding tothe 5th and 9th symbols in the additionally allocated time-frequencyresources. In addition, the UE may sequentially transmit REs of physicaluplink data channels corresponding to 12 symbols as shown in (b) of FIG.12 . In this case, the UE may transmit REs of physical uplink datachannels corresponding to the 13th symbol and the 14th symbol in theadditionally allocated time-frequency resource.

The UE may transmit a physical uplink channel that cannot be transmitteddue to preemption in a time-frequency resource different from thepreempted time-frequency resource. In this case, another time-frequencyresource may be a resource different from a resource for alreadyscheduled physical uplink transmission. For convenience of description,other time-frequency resources are referred to as additionaltime-frequency resources. The additional time-frequency resource may bea time-frequency resource for uplink transmission temporally locatedbehind a resource for physical uplink transmission already scheduled.The physical uplink channel scheduled for the preempted time-frequencyresource and the additional time-frequency resource may have the samefrequency resource. The additional time-frequency resource may be theclosest symbol among symbols designated as an uplink symbol according toa semi-static DL/UL assignment from a time-frequency resource in which aphysical uplink data channel scheduled on a preempted time-frequencyresource is scheduled. In another specific embodiment, the additionaltime-frequency resource may be an uplink symbol or a flexible symbolaccording to a semi-static assignment from a time-frequency resource inwhich a physical uplink channel scheduled for a preempted time-frequencyresource is scheduled. Further, the additional time-frequency resourcemay be a symbol located after N symbols after the physical uplinkchannel scheduled for the preempted time-frequency resource. In thiscase, N is a natural number. N can be configured through the RRC signal.In another specific embodiment, N may be a fixed number.

In a specific embodiment, the UL preemption indicator may includeinformation on a start symbol of an additional time-frequency resource.The UE may transmit a physical uplink channel that is not transmitteddue to preemption from the start symbol of the additional resourceindicated by the UL preemption indicator. In the embodiment of FIG. 12 ,the UL preemption indicator indicates A as a start symbol of anadditional time-frequency resource. As illustrated in (a) of FIG. 12 ,the UE may transmit RE of a PUSCH corresponding to the fifth and ninthsymbols that are not transmitted due to the preemption among symbolsafter A from the symbol in which a PUSCH scheduled for a preemptedtime-frequency resource is scheduled. In (a) of FIG. 12 , B is the RElength of the PUSCH corresponding to the fifth symbol. In addition, asillustrated in (b) of FIG. 12 , the UE may transmit RE of a PUSCHcorresponding to the 13th and 14th symbols among symbols after A fromthe symbol in which a PUSCH scheduled for a preempted time-frequencyresource is scheduled. In (b) of FIG. 12 , B is the RE length of thePUSCH corresponding to the 13th symbol.

The UL preemption indicator may indicate whether transmission of aphysical uplink channel that is not transmitted due to preemption isnecessary. The UE may determine whether to transmit a physical uplinkchannel that is not transmitted due to preemption based on the ULpreemption indicator. Specifically, the UL preemption indicator mayindicate whether physical uplink channels that cannot be transmitted dueto preemption are transmitted through a 1-bit field. For example, whenthe value of the 1-bit field is 1, the UE may transmit a physical uplinkchannel that is not transmitted due to preemption in an additionaltime-frequency resource. In addition, when the value of the 1-bit fieldis 0, the UE may not transmit a physical uplink channel that is nottransmitted due to preemption.

FIG. 13 shows a range of a physical uplink channel that a UE accordingto an embodiment of the present invention cannot transmit due topreemption.

When the time-frequency domain where the UL preemption indicatorindicates that it is preempted and the time-frequency resource scheduledfor transmission of the physical uplink channel of the UE partiallyoverlap, the UE may not transmit the entire physical uplink channel. In(a) of FIG. 13 , the time-frequency domain where the UL preemptionindicator indicates that it is preempted and the time-frequency resourcescheduled for transmission of the physical uplink channel of the UEpartially overlaps. In this case, the UE does not transmit the entirephysical uplink channel.

When the time-frequency domain where the UL preemption indicatorindicates that it is preempted and the time-frequency resource scheduledfor transmission of the physical uplink channel of the UE partiallyoverlap, the UE may not transmit the corresponding physical uplinkchannel only in symbols overlapping with the time-frequency domain wherethe UL preemption indicator that it is preempted In (b) of FIG. 13 , thetime-frequency domain where the UL preemption indicator indicates thatit is preempted and the time-frequency resource scheduled fortransmission of the physical uplink channel of the UE partiallyoverlaps. In this case, the UE does not transmit the correspondingphysical uplink channel in the symbol overlapping the time-frequencydomain where the UL preemption indicator indicates that it is preempted.

When the time-frequency domain where the UL preemption indicatorindicates that it is preempted and the time-frequency resource scheduledfor transmission of the physical uplink channel of the UE partiallyoverlap, the UE may not transmit the corresponding physical uplinkchannel in a time-frequency resource in which transmission of thecorresponding physical uplink channel is scheduled from the symbolcorresponding to the time-frequency domain where the UL preemptionindicator indicates that it is preempted In (c) of FIG. 13 , thetime-frequency domain where the UL preemption indicator indicates thatit is preempted and the time-frequency resource scheduled fortransmission of the physical uplink channel of the UE partiallyoverlaps. In this case, the UE does not transmit the correspondingphysical uplink channel from the symbol of the time-frequency domainwhere the UL preemption indicator indicates that it is preempted.

The physical uplink channel may include DMRS for channel estimation.When DMRS is not transmitted due to preemption, the base station may notreceive the physical uplink channel transmitted by the UE. The UE needsto transmit a physical uplink channel that cannot be transmitted due topreemption in consideration of whether to transmit DMRS. This will bedescribed with reference to FIG. 14 .

FIG. 14 shows an operation in which a UE transmits a physical uplinkchannel that cannot be transmitted due to preemption according to anembodiment of the present invention.

As described above, the UL preemption indicator may include informationon additional time-frequency resources. The UE may transmit a physicaluplink channel in the additional time-frequency resource based on theinformation on the additional time-frequency resource. In this case, theUE may transmit a physical uplink channel that cannot be transmitted dueto preemption. In another specific embodiment, the UE may transmit theentire physical uplink channel that has not been partially transmitteddue to preemption.

In this case, the information on the additional time-frequency resourcemay be expressed by the number of symbols or the number of slots.Specifically, the information on the additional time-frequency resourcemay indicate that the additional time-frequency resource is locatedafter several symbols from the last symbol of the time-frequencyresource in which preemption has been performed or the last symbol ofthe reference UL time-frequency resource. Alternatively, the informationon the additional time-frequency resource may indicate that theadditional time-frequency resource is located after several slots fromthe last symbol of the time-frequency resource in which preemption hasbeen performed or the last symbol of the reference UL time-frequencyresource. The symbol in which the additional time-frequency resource islocated may be the most advanced symbol after the time-frequencyresource in which preemption is performed among symbols assigned asuplink symbols according to semi-static DL/UL assignment. Also, a symbolin which the additional time-frequency resource is located may be asymbol indicated by DCI scheduling transmission of a physical uplinkchannel.

The UE may determine the type of physical uplink channel to betransmitted in additional time-frequency resources according to whetherthe DMRS of the physical uplink channel cannot be transmitted due topreemption. Specifically, when the UE fails to transmit the DMRS due topreemption, the UE may retransmit the entire physical uplink channelthat has not partially transmitted due to preemption in additionaltime-frequency resources. In addition, when the UE transmits the DMRSeven though preemption has occurred, the UE may transmit a part of thephysical uplink channel, which was not transmitted due to preemption inthe additional time-frequency resource. When the physical uplink channelthat is not transmitted due to preemption does not include DMRS, the UEmay transmit a part of the physical uplink channel and DMRS that are nottransmitted due to preemption in additional time-frequency resources.

In the embodiment of FIG. 14 , the UE determines a time-frequencyresource in which preemption has occurred based on the UL preemptionindicator. The UE cannot transmit a physical uplink channel due topreemption. In (a) of FIG. 14 , the UE cannot transmit the DMRS of thephysical uplink channel due to preemption. Therefore, the UE transmitsthe entire physical uplink channel in the additional time-frequencyresource indicated by the UL preemption indicator. In (b) of FIG. 14 ,the UE cannot transmit a part of the physical uplink channel due topreemption, but transmits the DMRS of the physical uplink channel.Therefore, the UE may transmit a part of the physical uplink channel,which was not transmitted due to preemption in the additionaltime-frequency resource. In this case, the UE transmits a part of thephysical uplink channel and the DMRS.

FIG. 15 shows a range of a physical uplink channel that a UE accordingto another embodiment of the present invention cannot transmit due topreemption.

The physical uplink data channel may include DMRS for channelestimation. In addition, the physical uplink data channel may includeuplink control information (UCI). In this case, the UCI may betransmitted in the RE around the DMRS symbol. If the preemption does notaffect the DMRS and UCI transmission, the UE may transmit a physicaluplink data channel in the symbol where the DMRS and UCI aretransmitted. In this case, the UE may not transmit a physical uplinkdata channel at a time-frequency where the UL preemption indicatorindicates that it is preempted as shown in (a) of FIG. 15 . In anotherspecific embodiment, the UE may not transmit a physical uplink datachannel in the remaining symbols except for the symbol through which theDMRS and UCI are transmitted, as shown in FIG. 15 (b). When preemptionaffects DMRS and UCI transmission, the UE may not transmit the entirephysical uplink data channel as shown in (c) of FIG. 15 . A case wherepreemption affects DMRS and UCI transmission may be a case where atime-frequency domain in which the UL preemption indicator indicatesthat preemption has occurred and a physical uplink channel in whichtransmission of DMRS or transmission of UCI is scheduled overlap.

FIG. 16 shows an operation in which the UE transmits DMRS and UCI thatcannot be transmitted due to preemption according to an embodiment ofthe present invention.

The UE may determine a type of a physical uplink data channel to betransmitted in an additional time-frequency resource according toinformation included in the physical uplink data channel. Specifically,depending on whether preemption affects uplink control information (UCI)transmission included in the physical uplink data channel, the UE maydetermine the type of physical uplink data channel to be transmitted inadditional time-frequency resources. A case where the preemption affectsUCI transmission included in the physical uplink data channel may be acase where at least a part of REs scheduled for UCI transmission cannotbe transmitted by preemption. When the preemption does not affect theUCI transmission included in the physical uplink data channel, the UEmay not transmit only the physical uplink data channel scheduled for thetime-frequency resource indicated by the UL preemption indicator. Inthis case, the UE may not transmit a physical uplink data channel thatcannot be transmitted due to preemption in an additional time-frequencyresource. When the preemption affects UCI transmission included in thephysical uplink data channel, the UE may not transmit the entirephysical uplink data channel or the physical uplink data channelindicated by the UL preemption indicator. In this case, the UE maytransmit the entire physical uplink data channel or the physical uplinkdata channel indicated by the UL preemption indicator in the additionaltime-frequency resource. In this case, the UE may transmit a physicaluplink data channel including only UCI in additional time-frequencyresources. Specifically, the UE may transmit a physical uplink datachannel except for a symbol to which only an uplink shared channel(UL-SCH) is mapped in the physical uplink data channel. In anotherspecific embodiment, the UE may transmit a physical uplink data channelexcept for a RE in which an uplink shared channel (UL-SCH) is mapped inthe physical uplink data channel. In another specific embodiment, the UEmay transmit a physical uplink data channel including both UL-SCH andUCI in additional time-frequency resources. In this embodiment, the UCImay be limited to HARQ-ACK information only. Alternatively, the UCI mayinclude HARQ-ACK information and CSI. In the embodiment of FIG. 16 , theUL preemption indicator indicates that REs scheduled for DMRS and UCItransmission are preempted. Therefore, the UE does not transmit theentire physical uplink data channel or the physical uplink data channelindicated by the UL preemption indicator. The UE transmits a physicaluplink data channel including only DMRS and UCI in an additionaltime-frequency resource indicated by the UL preemption indicator.

Specifically, depending on whether preemption affects transmission of atleast one of UCI and DMRS included in the physical uplink data channel,the UE may determine the type of physical uplink data channel to betransmitted in additional time-frequency resources. A case where thetransmission of the UCI included in the physical uplink data channel orthe transmission of the DMRS is affected may be a case where at least apart of the RE in which the UCI transmission is scheduled and the RE inwhich the DMRS transmission is scheduled cannot be transmitted by thepreemption. If the preemption does not affect the transmission of UCI orDMRS included in the physical uplink data channel, the UE may nottransmit the scheduled physical uplink data channel in thetime-frequency resource indicated by the UL preemption indicator. Inthis case, the UE may not transmit a physical uplink data channel thatcannot be transmitted due to preemption in an additional time-frequencyresource. When the preemption affects the transmission of UCI or DMRSincluded in the physical uplink data channel, the UE may not transmitthe entire physical uplink data channel. In this case, the UE maytransmit the entire physical uplink data channel in the additionaltime-frequency resource. In this case, the UE may transmit a physicaluplink data channel including only UCI in additional time-frequencyresources. In another specific embodiment, the UE may transmit aphysical uplink data channel including both UL-SCH and UCI in additionaltime-frequency resources. In this embodiment, the UCI may be limited toHARQ-ACK information only. Alternatively, the UCI may include HARQ-ACKinformation and CSI.

When a UE in which a physical uplink channel is preempted from ULpreemption indication transmits a physical uplink channel preemptedthrough an additional time-frequency resource, the UE may receiveanother UL preemption indicator. As such, when preemption occurs in theadditional time-frequency resource, the UE may not transmit a physicaluplink channel in the additional time-frequency resource. In this case,based on the UL preemption indicator indicating the preemption in theadditional time-frequency resource, the UE may transmit, in a newadditional time-frequency resource, a physical uplink channel that isnot transmitted by the preemption. Specifically, when the UL preemptionindicator indicating preemption in the additional time-frequencyresource indicates a new additional time-frequency resource, the UE maytransmit, in the new additional time-frequency resource, a physicaluplink channel that is not transmitted by preemption. In anotherspecific embodiment, even if the UL preemption indicator indicating thepreemption in the additional time-frequency resource indicates a newadditional time-frequency resource, the UE may not transmit, in a newadditional time-frequency resource, a physical uplink channel thatcannot be transmitted by the preemption.

When the physical uplink control channel is preempted, the UE maydetermine whether to transmit the physical uplink control channelaccording to information included in the physical uplink control channelin the additional time-frequency resource. Specifically, when thephysical uplink control channel includes HARQ-ACK, and preemptionaffects the physical uplink control channel transmission, the UE may nottransmit on the time-frequency resource in which the correspondingphysical uplink control channel transmission is scheduled. In this case,the UE may transmit a physical uplink control channel that cannot betransmitted due to preemption in an additional time-frequency resource.

In the above-described embodiments, a method of transmitting a physicalchannel of a UE has been described when a time-frequency resourcescheduled for uplink transmission of the UE is used by another UE. Thebase station may reschedule time-frequency resources scheduled foruplink transmission of the UE to other uplink transmission of thecorresponding UE in consideration of differences in reliability anddifferences in QoS conditions. Specifically, the base station mayschedule physical uplink transmission including URLLC data in atime-frequency resource in which the physical uplink transmission of theUE is scheduled. Specifically, transmission of a physical uplink channelincluding URLLC data of the UE may be scheduled in a time-frequencyresource in which transmission of UCI transmitted in the PUSCH/PUCCH ofthe UE is scheduled. In this case, the UCI may be any one of HARQ-ACKand CSI. In this case, methods of a UE to transmit the UCI and drop theUCI transmission need to be defined. In addition, the UE needs tomultiplex data transmissions having different QoS conditions anddifferent transmission durations. In addition, the UE needs to multiplexdata transmissions requiring different reliability. Embodiments for suchtransmission will be described.

A case where physical uplink data channel transmission of data having arelatively low priority by the UE is preempted by physical uplink datachannel transmission of data having a relatively high priority by the UEwill be described first. In this specification, the priority may bereplaced by at least one of QoS conditions and reliability conditions.For convenience of description, data having a relatively low priority isreferred to as general data, and data having a higher priority thangeneral data is referred to as priority data.

When the physical uplink data channel transmission of the priority dataof the UE is scheduled in the time-frequency resource in which the UCItransmission of the physical uplink data channel of the general dataincluding the UCI of the UE is scheduled, the UE may transmit UCI of aphysical uplink data channel of the general data. Specifically, when thephysical uplink data channel transmission of the priority data of the UEis scheduled in the time-frequency resource in which the UCItransmission of the physical uplink data channel of the UE is scheduled,the UE may transmit the UCI of the physical uplink data channel of thegeneral data by mapping the UCI of the physical uplink data channel ofthe general data to the remaining time-frequency resources that excludethe time-frequency resource scheduled for the physical uplink datachannel transmission of the priority data from the time-frequencyresource scheduled for transmission of the physical uplink data channelof the general data. When the time-frequency resource in which the UCItransmission of the physical uplink data channel of the general data ofthe UE is scheduled does not overlap with the physical uplink datachannel transmission of the UE's priority data, the UE may transmit thephysical uplink data channel of the general data scheduled in thetime-frequency resource except the time-frequency resource in which thephysical uplink data channel transmission of the priority data isscheduled.

In another specific embodiment, when the physical uplink data channeltransmission of the priority data of the UE is scheduled in thetime-frequency resource in which the UCI transmission of the physicaluplink data channel of the general data including the UCI of the UE isscheduled, the UE may determine whether to transmit UCI according to thetype of UCI. When UCI is HARQ-ACK, the UE may transmit UCI by mappingthe RE of the physical uplink data channel of the general data to theremaining time-frequency resources that exclude the time-frequencyresource in which the physical uplink data channel transmission of thepriority data is scheduled from a time-frequency resource in whichtransmission of a physical uplink data channel of the general data isscheduled. In addition, when the UCI is CSI part1 or CSI part2, the UEmay drop UCI transmission. When HARQ-ACK transmission is dropped,downlink transmission throughput may be reduced. This can be preventedthrough the above-described embodiment.

In another specific embodiment, when the UCI is HARQ-ACK or CSI part1,the UE may transmit UCI by mapping the RE of the physical uplink datachannel of the general data to the remaining time-frequency resourcesthat exclude the time-frequency resource in which the physical uplinkdata channel transmission of the priority data is scheduled from atime-frequency resource in which transmission of a physical uplink datachannel of the general data is scheduled. In addition, when the UCI isCSI part2, the UE may drop UCI transmission. When the HARQ-ACK and CSIpart1 transmission is dropped, downlink transmission throughput may bereduced. This can be prevented through the above-described embodiment.

In the above-described embodiments, the physical uplink data channeltransmission of the priority data of the UE may be scheduled in thetime-frequency resource in which all UCI transmission of the physicaluplink data channel of the general data including the UCI of the UE isscheduled. In this case, the UE may transmit all UCIs of the physicaluplink data channel of the general data in the remaining time-frequencyresources that exclude the time-frequency resource in which the physicaluplink data channel transmission of the priority data is scheduled froma time-frequency resource in which transmission of a physical uplinkdata channel of the general data is scheduled. In addition, physicaluplink data channel transmission of the UE's priority data may bescheduled in a time-frequency resource in which some UCI transmission ofthe physical uplink data channel of the UE's general data is scheduled.In this case, the UE may transmit some overlapping UCIs of the physicaluplink data channel of the general data in the remaining time-frequencyresources that exclude the time-frequency resource in which the physicaluplink data channel transmission of the priority data is scheduled froma time-frequency resource in which transmission of a physical uplinkdata channel of the general data is scheduled.

A case where the physical uplink control channel transmission of data(general data) having a relatively low priority by the UE is preemptedby the physical uplink data channel transmission of data (priority data)having a relatively high priority by the UE will be described.

When the physical uplink data channel transmission of the priority dataof the UE is scheduled in the time-frequency resource in which thetransmission of the physical uplink control channel of the general dataof the UE is scheduled, the UE may drop the transmission of the physicaluplink control channel of the UE's general data. Specifically, the UEmay drop a physical uplink control channel transmission of a specificcell group in which a physical uplink control channel of the prioritydata is scheduled. This is because inter-modulation distortion (IMD) mayoccur when a physical uplink control channel and a physical uplink datachannel are simultaneously transmitted from different frequencyresources.

In another specific embodiment, when the physical uplink data channeltransmission of the priority data of the UE is scheduled in thetime-frequency resource in which the transmission of the physical uplinkcontrol channel of the general data of the UE is scheduled, the UE maydetermine whether to drop the transmission of the physical uplinkcontrol channel according to the type of UCI of the physical uplinkcontrol channel. Specifically, the UE may determine whether to drop thetransmission of the physical uplink control channel according to whetherthe UCI of the physical uplink control channel includes HARQ-ACK. Whenthe UCI of the physical uplink control channel does not includeHARQ-ACK, the UE may drop transmission of the physical uplink controlchannel. When the UCI of the physical uplink control channel includesHARQ-ACK, the UE may multiplex the physical uplink control channel andthe physical uplink data channel of the priority data to transmit thephysical uplink control channel and the physical uplink data channel ofthe priority data. A method of multiplexing a physical uplink controlchannel and a physical uplink data channel of the priority data will bedescribed.

In order not to allow the symbol in which the physical uplink datachannel of the priority data is transmitted in one slot overlaps withthe physical uplink data channel of the general data, the UE maytransmit a physical uplink data channel of priority data and a physicaluplink control channel of the general data through time divisionmultiplexing (TDM). Specifically, the UE may transmit a physical uplinkcontrol channel of the general data using a shortened physical uplinkcontrol channel format in a symbol which does not overlap with thephysical uplink data channel of the priority data. In this case, theshortened physical uplink control channel format may be in the form of aphysical uplink control channel in which some of the time domains inwhich the corresponding physical uplink control channel is scheduled arepunctured. Specifically, it may be a shortened PUCCH format. Throughthis, the physical uplink data channel and the physical uplink controlchannel may be simultaneously transmitted to prevent the IMD fromoccurring. In this case, the symbol may be a DFTs-OFDM symbol or an OFDMsymbol. In a specific embodiment, when the physical uplink data channelof the priority data is transmitted in consecutive symbols, the UE maytransmit a physical uplink data channel of the priority data and aphysical uplink control channel of the general data together in one slotusing TDM at a symbol level. When a physical uplink data channel of thepriority data is transmitted in a discontinuous symbol, the UE may droptransmission of a physical uplink control channel of the general data.This is because the shortened physical uplink control channel formatcannot be used.

The UE may puncture the time-frequency resource in which the physicaluplink control channel transmission of the general data is scheduled inthe time-frequency resource in which the physical uplink data channel ofthe priority data is scheduled to transmit a physical uplink datachannel of priority data. This is because physical uplink controlchannel reception including HARQ-ACK may be necessary according to QoSand requirements of downlink data. When the base station schedules thetransmission of the priority data, the base station may determine that apart of the priority data is punctured to transmit a physical uplinkcontrol channel of the general data. Even if a part of the priority datais punctured so that a physical uplink control channel of the generaldata is transmitted, the base station can receive the priority data. Inaddition, even if a physical uplink control channel and a physicaluplink data channel are transmitted in the same symbol, there is nofrequency separation between the two channels, so that IMD may notoccur.

The UE may piggyback the physical uplink control channel of the generaldata to the physical uplink data channel of the priority data totransmit it. In this case, the UE may not directly and simultaneouslytransmit the physical uplink data channel of the priority data and thephysical uplink control channel of the general data. Specifically, theUE may first piggyback the UCI to be transmitted through the physicaluplink control channel of the general data to the physical uplink datachannel of the data and transmit it. The UE piggybacks all UCIs to thephysical uplink data channel of the priority data to transmit it. Inanother specific embodiment, the UE may determine whether to transmitthe UCI by piggybacking the UCI to the physical uplink data channel ofthe priority data according to the type of the UCI. For example, whenthe type of the UCI is HARQ-ACK, the UE may transmit the UCI bypiggybacking the UCI to the physical uplink data channel of the prioritydata. Or, when the type of UCI is HARQ-ACK or CSI part1, the UE maypiggyback the UCI to the physical uplink data channel of priority datato transmit it.

The UE may transmit the UCI to be transmitted through the physicaluplink control channel of the general data through the N symbolsfollowing the physical uplink data channel of the priority data. In thiscase, N is a natural number. Specifically, the UE may designate Nsymbols after a physical uplink data channel of the priority data as areserved symbol, and transmit the UCI to be transmitted through thephysical uplink control channel of the general data through the Nsymbols.

The base station may schedule the physical uplink data channel of thepriority data in consideration of the UCI size of the physical uplinkcontrol channel of the general data. Specifically, the base station mayschedule the UCI of the physical uplink data channel of the prioritydata and the physical uplink control channel of the general data so asnot to overlap in consideration of the UCI size of the physical uplinkchannel of the general data.

In the above-described embodiments, it has been described that physicaluplink data channel transmission of the priority data is scheduled againin a time-frequency resource in which physical uplink control channeltransmission is scheduled. However, the above-described embodiments maybe applied even when a physical uplink data channel transmission ofother priority data is scheduled when a time-frequency resource in whichthe physical uplink control channel transmission of the priority data isscheduled is scheduled. That is, the above-described embodiments may beapplied even when the physical uplink data channel transmission of otherdata having the same priority is scheduled in the time-frequencyresource in which the physical uplink control channel transmission ofany one data is scheduled.

A case where a physical uplink control channel transmission of datahaving a relatively low priority (general data) by the UE and a physicaluplink control channel transmission of data having a relatively highpriority (priority data) by the UE are configured in the one symbol, ora case where the physical uplink control channel transmissions of datahaving the same priority by the UE is configured in the one symbol willbe described. In this case, the UE may transmit UCIs of two physicaluplink control channels scheduled on the one symbol using one physicaluplink control channel in a slot in which two physical uplink controlchannels are scheduled. In this case, a method in which the UE selects atime frequency resource to transmit the one physical uplink controlchannel may be a problem. In addition, the UE may transmit the onephysical uplink control channel of the two physical uplink controlchannels scheduled in the one symbol in a first scheduled time-frequencyresource, and transmit the remaining physical uplink control channels indifferent time frequency resources that do not overlap with any onephysical uplink control channel. In this case, a method in which the UEselects a time-frequency resource to transmit the remaining physicaluplink control channel may be a problem. A method in which a UE selectsa time-frequency resource in which one physical uplink control channelincluding UCIs of two physical uplink control channels scheduled in thesame symbol will be transmitted or another time-frequency resource inwhich the remaining physical uplink control channel will be transmittedwill be described in detail with reference to FIG. 17 . In addition, forconvenience of description, a physical uplink channel transmitting UCIof two physical uplink control channels scheduled on the one symbol or aphysical uplink control channel transmitted in another time-frequencyresource among two physical uplink control channels is referred to as analternate physical uplink control channel. A time-frequency resource inwhich the alternate physical uplink control channel transmission isscheduled is referred to as an alternate time-frequency resource.

FIG. 17 shows a method for a UE to select an alternate physical uplinkcontrol channel according to an embodiment of the present invention.

The base station may configure a plurality of time-frequency resourcesin which the UE may transmit a physical uplink control channel in oneslot. The UE may select one time-frequency resource among a plurality oftime-frequency resources and transmit an alternate physical uplinkcontrol channel in the selected time-frequency resource.

The UE may determine an alternate time-frequency resource to transmitthe alternate physical uplink control channel based on the positions ofthe last symbols of the time-frequency resources occupied by theplurality of physical uplink control channels configured by the basestation in the slots in which two physical uplink control channels areconfigured. Specifically, the UE may select a time-frequency resource ofa physical uplink control channel in which the last symbol is the mostadvanced among the time-frequency resources of a plurality of physicaluplink channels in a slot configured with two physical uplink controlchannels as an alternative time-frequency resource, and transmit it tothe alternate physical uplink control channel through the selectedalternate time-frequency resource.

The time-frequency resource of the physical uplink control channel inwhich the last symbol is the most advanced may be plural. In this case,the UE may select an alternative time-frequency resource based on thenumber of symbols of the time-frequency resource of the physical uplinkcontrol channel after the last symbol position of the time-frequencyresource of the physical uplink control channel. Specifically, the UEmay select a time-frequency resource of the physical uplink controlchannel having the longest length (the largest number of symbols) amongthe time-frequency resources of the physical uplink control channel inwhich the last symbol is the most advanced as the alternativetime-frequency resource. The UE may transmit an alternate physicaluplink control channel through the selected alternate time-frequencyresource. That is, the UE may select a physical uplink control channeltime-frequency resource to transmit the alternate physical uplinkcontrol channel in consideration of the position of the start symbol ofthe time-frequency resource of the physical uplink control channel afterthe position of the last symbol of the time-frequency resource of thephysical uplink control channel.

When a plurality of physical uplink control channel time-frequencyresources are selected based on the length of the physical uplinkcontrol channel time-frequency resource after the last symbol positionof the time-frequency resource of the physical uplink control channel,the UE may arbitrarily select one of the time-frequency resources of theselected plurality of physical uplink control channels and transmit thealternate physical uplink control channel through the selectedtime-frequency resource. For example, in step 1, the UE may select atime-frequency resource of a physical uplink control channel in whichthe last symbol is the most advanced among channel time-frequencyresources of a plurality of physical uplink controls in a predeterminedslot as a first candidate alternative time-frequency resource set. Ifthe first candidate alternative time-frequency resource set includes aplurality of physical uplink control channel time-frequency resources,in step 2, the UE may select the time-frequency resource of the physicaluplink control channel having the longest length in the first candidatealternative time-frequency set as the second candidate alternativetime-frequency set. If the second candidate alternative time-frequencyresource set includes a plurality of physical uplink control channeltime-frequency resources, in step 3, the UE randomly may select atime-frequency resource of any one physical uplink control channel fromthe second candidate alternative time-frequency resource set to selectit as an alternative time-frequency resource, and transmit the alternatephysical uplink control channel in the selected alternativetime-frequency resource. If there is one time-frequency resource of thephysical uplink control channel corresponding to the alternativetime-frequency set, the UE may select a time-frequency resource of thecorresponding physical uplink control channel as an alternativetime-frequency resource without additional selection and transmit thealternate physical uplink control channel through the selectedalternative time-frequency resource.

In the embodiment of FIG. 17 , time-frequency resources of five physicaluplink control channels are configured in slots in which two physicaluplink control channel transmissions are scheduled in the one symbol. Inthis case, the UE selects the second and fourth physical uplink controlchannel time-frequency resources in which the position of the lastsymbol is the most advanced among the time-frequency resources of the 5physical uplink control channels as the time-frequency resource set ofthe first candidate physical uplink channel. In addition, the UE selectsthe time-frequency resource of the fourth physical uplink channel havingthe longest length (the largest number of symbols) in the time-frequencyresource set of the first candidate physical uplink control channel asthe time-frequency resource set of the second candidate physical uplinkcontrol channel. Since the time-frequency resource of the physicaluplink control channel included in the time-frequency resource set ofthe second candidate physical uplink control channel is 1, the UEtransmits an alternate physical uplink control channel through a fourthphysical uplink control channel time-frequency resource.

The UE may select an alternate physical uplink control channel from thephysical uplink control channels scheduled for the time-frequencyresource having the same or earlier symbol than the last symbol in thetwo time-frequency resources scheduled in the one symbol. This operationmay be applied to the above-described embodiments.

For example, in step 1, the UE may select a physical uplink controlchannel time-frequency resource having a last symbol that is the same asor before the latest symbol in the time-frequency resources of aplurality of physical uplink control channels in a given slot among thetime-frequency resources in which two physical uplink control channelsin which the last symbol is scheduled in the one symbol are scheduled asa first candidate physical uplink control channel set. In step 2, the UEmay select the time-frequency resource of the physical uplink controlchannel in which the last symbol is the most advanced in the firstcandidate physical uplink control channel set as the second candidatephysical uplink control channel time-frequency resource set. When thesecond candidate physical uplink control channel time-frequency resourceset includes time-frequency resources of a plurality of physical uplinkcontrol channels, in step 3, the UE may select the longest physicaluplink control channel time-frequency resource from the second candidatephysical uplink control channel time-frequency set as the time-frequencyset of the third candidate physical uplink control channel. When thetime-frequency resource set of the third candidate physical uplinkcontrol channel includes time-frequency resources of a plurality ofphysical uplink control channels, in step 4, the UE randomly may selecta time-frequency resource of any one physical uplink control channelfrom the time-frequency resource set of the third candidate physicaluplink control channel, and transmit the alternate physical uplinkcontrol channel from the time-frequency resource of the selectedphysical uplink control channel. When there is one time-frequencyresource of the physical uplink control channel corresponding to thetime-frequency set of the candidate physical uplink control channel, theUE may transmit the alternate physical uplink control channel throughthe time-frequency resource of the corresponding physical uplink controlchannel without additional selection.

The first physical uplink control channel may include time-sensitiveinformation such as HARQ-ACK of the URLLC service. In addition, decodingof the physical uplink control channel may be performed after allphysical uplink control channels are received. Therefore, through theexamples described above, the UCI intended to be transmitted through thefirst physical uplink control channel can be transmitted and decoded asquickly as possible. In addition, as the physical uplink control channelis longer, the reliability of UCI transmission is higher. Therefore, thereliability of the transmission of the alternate physical uplink controlchannel can be increased through the examples described above.

The physical uplink control channel may include a plurality of types ofUCI according to the type of UCI information, such as HARQ-ACK, CSIPart1, and CSI Part2. In this case, the UE may transmit only some UCItypes among the UCIs that the UE intends to transmit through thephysical uplink control channel through the alternate physical uplinkcontrol channel. In this case, the UE may select the UCI to betransmitted through the alternate physical uplink control channel basedon the priority of the UCI type.

As described above, the UE may transmit one physical uplink controlchannel of two physical uplink control channels scheduled in the samesymbol in a time-frequency resource in which the corresponding physicaluplink control channel is scheduled, and transmit the other physicaluplink control channel in the alternate physical time-frequencyresource. In this case, the UE may select a physical uplink controlchannel to be transmitted in a time-frequency resource in which thecorresponding physical uplink control channel is scheduled according tothe priority between the physical uplink control channels. In this case,the UE may transmit an unselected physical uplink control channel in analternate physical time-frequency resource.

In a specific embodiment, the UE may obtain a priority between physicaluplink control channels from a base station. Specifically, when the DCIconfigures the transmission of the physical uplink control channel ofthe UE, the UE may obtain the priority between the physical uplinkcontrol channels through the DCI. A case where the DCI configures thetransmission of the physical uplink control channel of the UE may be acase where the DCI configures the HARQ-ACK transmission of the UE. Inaddition, a case where the DCI configures the transmission of thephysical uplink control channel of the UE may be a case where the DCIconfigures the aperiodic CSI transmission of the UE. The prioritybetween the physical uplink control channels may be explicitly indicatedthrough a separate field of DCI.

In another specific embodiment, the priority between physical uplinkcontrol channels may be implicitly indicated in the DCI field. Prioritybetween physical uplink control channels may be determined according toa HARQ process number (HPN). The priority between the physical uplinkcontrol channels may be determined according to a time-domain allocationfield. Specifically, HARQ-ACK of a physical downlink data channelscheduled in the time-domain allocation field may have a higherpriority. The priority between the physical uplink control channels maybe determined based on the MCS used for transmission of a targetsignaled by the UCI of the physical uplink control channel.Specifically, a priority between physical uplink control channels may bedetermined such that a physical uplink control channel includingHARQ-ACK of a physical downlink data channel that is more reliablytransmitted has a higher priority. In a specific embodiment, a prioritybetween physical uplink control channels may be determined such that aphysical uplink control channel including HARQ-ACK of a physicaldownlink data channel transmitted at a lower code rate has a higherpriority. The priority between the physical uplink control channels maybe determined based on the MCS used for transmission of a targetsignaled by the UCI of the physical uplink control channel. The prioritybetween physical uplink control channels may be determined based on aphysical uplink control channel resource indicator. Specifically, thepriority between physical uplink control channels may be determined tohave a higher priority as the value of the physical uplink controlchannel resource indicator indicating the physical uplink controlchannel is smaller. The priority between physical uplink controlchannels may be determined based on a physical uplink control channelresource indicator. Specifically, the priority between the physicaluplink control channels may be determined to have a higher priority asthe symbol scheduled with the physical uplink control channel isadvanced. The priority between the physical uplink control channels maybe determined according to a time sequence in which a physical downlinkcontrol channel indicating a physical uplink control channel or a DCIindicating a physical uplink control channel is transmitted.Specifically, the priority between the physical uplink control channelsmay be determined to have a higher priority as the time at which thephysical downlink control channel indicating the physical uplink controlchannel or the DCI indicating the physical uplink control channel istransmitted is advanced. The priority between the physical uplinkcontrol channels may be determined according to the servicecharacteristics of the physical downlink data channel scheduled by thephysical downlink control channel indicating the time-frequency resourcein which the physical uplink control channel is scheduled. Specifically,the physical uplink control channel scheduled by the physical downlinkcontrol channel for scheduling the physical downlink data channel of theURLLC service may have a higher priority than the physical uplinkcontrol channel scheduled by the physical downlink control channelscheduling the physical downlink data channel of the eMBB service. TheUE may determine the service characteristics of the physical downlinkdata channel scheduled by the physical downlink control channel based onthe RNTI value of the physical downlink control channel. In anotherspecific embodiment, the UE may determine a service characteristic of aphysical downlink data channel scheduled by the physical downlinkcontrol channel according to the value of the DCI field. The prioritybetween the physical uplink control channels may be determined accordingto the type of UCI included in the physical uplink control channel.Specifically, a physical uplink control channel including HARQ-ACK mayhave a higher priority than a physical uplink control channel includingCSI. The priority between the physical uplink control channels may bedetermined according to the K1 value indicating the transmission timeinterval between the HARQ-ACK included in the physical uplink controlchannel and the physical downlink data channel. Specifically, thepriority between physical uplink control channels may be determined tohave a higher priority as the K1 value is smaller. This is because asthe interval between the physical downlink data channel and HARQ-ACK issmaller, fast processing may be further required.

In addition, the UE may transmit a physical uplink control channelhaving the same priority through one physical uplink control channel. Inthis case, the UE may determine a time-frequency resource in which thecorresponding physical uplink control channel is transmitted accordingto the above-described embodiments.

In addition, the UE may transmit the corresponding physical uplinkcontrol channel through a shortened format instead of dropping thetransmission of the lower priority physical uplink control channel.Specifically, the UE may transmit a physical uplink control channelhaving a relatively low priority through a shortened format in atime-frequency resource except for a time-frequency resource in which aphysical uplink control channel having a relatively high priority istransmitted. In addition, when the UE creates a shortened-formatphysical uplink control channel, a UE may puncture a UCI of a symboloverlapping in a time domain with a physical uplink control channelhaving a relatively high priority. In another specific embodiment, theUE may rate-match a physical uplink control channel having a relativelylow priority to a physical uplink control channel in a shortened format.Specifically, the UE may determine the time-frequency resource of thephysical uplink control channel according to the code rate using onlythe time-frequency resource to be used for transmission. When thephysical uplink control channel is Format 2 or Format 3, the number ofPRBs, which are frequency resources occupied by the physical uplinkcontrol channel, may be determined according to the UCI of the physicaluplink control channel and the configured code rate. The UE maydetermine the number of PRB s in the shortened format using resourcesthat can be actually transmitted (resources of symbols other than thepunctured symbol) and the configured code rate. When DMRS cannot betransmitted through the shortened-format physical uplink controlchannel, the UE may drop the corresponding physical uplink controlchannel transmission. A case where the DMRS cannot be transmittedthrough the short-format physical uplink control channel may include acase where the DMRS cannot be transmitted due to the length of theshortened-format physical uplink control channel.

The UE may transmit a grant-free (GF) physical uplink data channel or agrant based (GB) configured physical uplink data channel. In this case,the grant-free configured physical uplink data channel may be a physicaluplink data channel scheduled through RRC configuration. The grant-freephysical uplink data channel may be referred to as a configured grantphysical uplink data channel. Also, the grant based configured physicaluplink data channel may be a physical uplink data channel configuredthrough DCI of the physical downlink control channel. When thetime-frequency resource in which the grant-free configured physicaluplink data channel is scheduled overlaps with the grant basedconfigured physical uplink data channel, the UE may drop transmission ofone of the two physical uplink data channels and transmit only the otherone physical uplink data channel. In this case, the operation method ofthe UE will be described.

When there is data (e.g., UL-SCH) to be transmitted through thegrant-free physical uplink data channel, the UE may drop the grant-basedphysical uplink data channel transmission and transmit the grant-freephysical uplink data channel. This is because the grant-free physicaluplink data channel may be more suitable for services requiring rapidtransmission such as URLLC data. In a specific embodiment, when thetransmission period of the grant-free physical uplink data channel isshorter than a specific period, and there is data (e.g., UL-SCH) to betransmitted through the grant-free physical uplink data channel, the UEmay drop the grant-based physical uplink data channel transmission andtransmit the grant-free physical uplink data channel. In a specificembodiment, when the transmission period of the grant-free physicaluplink data channel is not shorter than a specific period, the UE maytransmit the grant-based physical uplink data channel and drop thegrant-free physical uplink data channel transmission. When the UE dropsthe grant-based physical uplink data channel transmission and transmitsthe grant-free physical uplink data channel, the UE may transmit UCI,which should be transmitted through the grant-based physical uplink datachannel, through the grant-free physical uplink data channel. In thiscase, the UE may transmit all UCIs to be transmitted through thegrant-based physical uplink data channel through the grant-free physicaluplink data channel. In another specific embodiment, the UE may transmitsome UCIs to be transmitted through the grant-based physical uplink datachannel through the grant-free physical uplink data channel. Forexample, when the grant-based physical uplink data channel is includedin the aperiodic CSI, the UE may transmit all or part of the aperiodicCSI through the grant-free physical uplink data channel. When thegrant-based physical uplink data channel includes CSI part1 and CSIpart2, the UE may transmit only CSI part1 among CSI part1 and CSI part2through the grant-free physical uplink data channel. When thegrant-based physical uplink data channel includes HARQ-ACK and aperiodicCSI, the UE may transmit all or part of HARQ-ACK and aperiodic CSIthrough the grant-free physical uplink data channel. In this case, theUE can transmit only the HARQ-ACK through the grant-free physical uplinkdata channel without transmitting the CSI. In another specificembodiment, the UE may transmit only HARQ-ACK and CSI part1 through thegrant-free physical uplink data channel without transmitting CSI part2.

In another specific embodiment, when the time-frequency resource inwhich the grant-based physical uplink data channel is scheduled and thetime-frequency resource in which the grant-free physical uplink datachannel is scheduled overlap, the base station may signal which physicaluplink data channel of the grant-based physical uplink data channel orthe grant-free physical uplink data channel is transmitted.Specifically, the base station may signal which physical uplink datachannel among the grant-based physical uplink data channel and thegrant-free physical uplink data channel will be transmitted by the UE inthe DCI scheduling grant-based physical uplink data channel. The UE maydetermine which physical uplink data channel to transmit among thegrant-based physical uplink data channel and the grant-free physicaluplink data channel based on DCI scheduling the grant-based physicaluplink data channel. Specifically, the DCI may signal which physicaluplink data channel will be transmitted by the UE among the grant-basedphysical uplink data channel and the grant-free physical uplink datachannel. In a specific embodiment, the 1-bit field of the DCI may signalwhich physical uplink data channel will be transmitted by the UE amongthe grant-based physical uplink data channel and the grant-free physicaluplink data channel.

In another specific embodiment, the DCI may implicitly signal whichphysical uplink data channel will be transmitted by the UE among thegrant-based physical uplink data channel and the grant-free physicaluplink data channel. For example, when the code rate of the MCS value ofthe physical downlink control channel (or DCI) scheduling thegrant-based physical uplink data channel is smaller than a specificvalue, the UE may transmit the grant-based physical uplink data channeland drop the grant-free physical uplink data channel transmission. Whenthe code rate of the MCS value of the physical downlink control channel(or DCI) scheduling the grant-based physical uplink data channel isgreater than a specific value, the UE may drop the grant-based physicaluplink data channel transmission and transmit the grant-free physicaluplink data channel transmission. In this case, the specific value maybe a predetermined value. Also, a specific value may be configured by anRRC signal. Also, the specific value may be a value configured when thegrant-free physical uplink data channel is configured.

The UE may determine which physical uplink data channel to transmitamong the grant-based physical uplink data channel and the grant-freephysical uplink data channel based on the location of the symbol throughwhich the grant-based physical uplink data channel is transmitted andthe location of the symbol through which of the grant-free physicaluplink data channels is transmitted. Specifically, when the transmissionof the grant-based physical uplink data channel is terminated before thegrant-free physical uplink data channel transmission, the UE maytransmit the grant-based physical uplink data channel and drop thegrant-free physical uplink data channel transmission. When thetransmission of the grant-based physical uplink data channel does notend before the grant-free physical uplink data channel transmission, theUE may drop the grant-based physical uplink data channel transmissionand transmit a grant-free physical uplink data channel.

The UE may determine which physical uplink data channel to transmitamong the grant-based physical uplink data channel and the grant-freephysical uplink data channel based on the K2 value of DCI scheduling thegrant-based physical uplink data channel. In this case, the K2 value isa value indicating an interval between a physical downlink controlchannel and the grant-based physical uplink data channel. Specifically,when the K2 value is smaller than a specific value, the UE may transmitthe grant-based physical uplink data channel and drop the grant-freephysical uplink data channel transmission. Specifically, when the K2value is equal to or greater than the specific value, the UE may dropthe grant-based physical uplink data channel and transmit the grant-freephysical uplink data channel transmission. The specific value may be afixed value. For example, the specific value may be 0 or 1. In anotherspecific embodiment, the specific value may be a value configured fromthe higher layer. In another specific embodiment, the specific value maybe determined based on the period of the grant-free physical uplink datachannel. For example, the specific value may be a period of a grant-freephysical uplink data channel.

In the above-described embodiments, the physical data channel mayinclude a PDSCH or a PUSCH. In addition, the physical control channelmay include a PDCCH or a PUCCH. In addition, in the embodiment describedusing PUSCH, PDCCH, PUCCH, and PDCCH, other types of data channels andcontrol channels may be applied.

The method and system of the present disclosure are described inrelation to specific embodiments, configuration elements, a part of orthe entirety of operations of the present disclosure may be implementedusing a computer system having general purpose hardware architecture.

The aforementioned description of the present disclosure has beenpresented for the purposes of illustration and description. It isapparent to a person having ordinary skill in the art to which thepresent disclosure relates that the present disclosure can be easilymodified into other detailed forms without changing the technicalprinciple or essential features of the present disclosure. Therefore,these embodiments as described above are only proposed for illustrativepurposes and do not limit the present disclosure. For example, eachcomponent described to be of a single type can be implemented in adistributed manner. Likewise, components described to be distributed canbe implemented in a combined manner.

The scope of the present disclosure is presented by the accompanyingClaims rather than the aforementioned description. It should beunderstood that all changes or modifications derived from thedefinitions and scopes of the Claims and their equivalents fall withinthe scope of the present disclosure.

1-20. (canceled)
 21. A user equipment (UE) for use in a wirelesscommunication system, the UE comprising: a communication module; and aprocessor configured to control the communication module, wherein theprocessor is configured to: receive configuration information related toa cyclic period for monitoring an uplink (UL) preemption indicator;receive scheduling information for a physical uplink shared channel(PUSCH) transmission; after a reception of the scheduling information,receive a common physical downlink control channel (PDCCH) including theUL preemption indicator during a monitoring time configured by thecyclic period; and based on the PUSCH transmission being overlapped withat least one resource part indicated by the UL preemption indicatorwithin a reference time-frequency resource, cancel a portion of thePUSCH transmission based on the at least one resource part, wherein astarting time of the reference time-frequency resource is located afterthe monitoring time, at least by a time interval associated with a PUSCHprocessing time.
 22. The UE of claim 21, wherein the referencetime-frequency resource excludes a downlink symbol configured accordingto a semi-static downlink (DL)/UL assignment.
 23. The UE of claim 21,wherein the PUSCH processing time is a minimum time required for the UEto receive a PDCCH for scheduling the PUSCH and to transmit the PUSCH.24. The UE of claim 21, wherein the UL preemption indicator includes abitmap including N bits, and each of the N bits corresponds to arespective one of N resource parts within the reference time-frequencyresource, wherein each of one or more first resource parts among the Nresource parts is configured to have P symbols, and each of remainingsecond resource parts among the N resource parts is configured to have Qsymbols, wherein P and Q are set so that a difference between P and Q isto be at most 1, and wherein N, P and Q are natural numbers.
 25. The UEof claim 21, wherein the UL preemption indicator includes a bitmapincluding N bits, and each of the N bits corresponds to a respective oneof N resource parts within the reference time-frequency resource,wherein each of mod (S, N) resource parts among the N resource partsincludes ceil (S/N) symbols, and each of N-mod (S, N) resource partsamong the N resource parts includes floor (S/N) symbols, and wherein Sis a number of symbols within the reference time-frequency resource, Nis a natural number, mod ( ) represents a modulo function, ceil ( )represents a ceiling function, and floor ( ) represents a flooringfunction.
 26. A method for operating a user equipment (UE) of a wirelesscommunication system, the method comprising: receiving configurationinformation related to a cyclic period for monitoring an uplink (UL)preemption indicator; receiving scheduling information for a physicaluplink shared channel (PUSCH) transmission; after a reception of thescheduling information, receiving a common physical downlink controlchannel (PDCCH) including the UL preemption indicator during amonitoring time configured by the cyclic period; and based on the PUSCHtransmission being overlapped with at least one resource part indicatedby the UL preemption indicator within a reference time-frequencyresource, canceling a portion of the PUSCH transmission based on the atleast one resource part, wherein a starting time of the referencetime-frequency resource is located after the monitoring time, at leastby a time interval associated with a PUSCH processing time.
 27. Themethod of claim 26, wherein the reference time-frequency resourceexcludes a downlink symbol configured according to a semi-staticdownlink (DL)/UL assignment.
 28. The method of claim 26, wherein thePUSCH processing time is a minimum time required for the UE to receive aPDCCH for scheduling the PUSCH and to transmit the PUSCH.
 29. The methodof claim 26, wherein the UL preemption indicator includes a bitmapincluding N bits, and each of the N bits corresponds to a respective oneof N resource parts within the reference time-frequency resource,wherein each of one or more first resource parts among the N resourceparts is configured to have P symbols, and each of remaining secondresource parts among the N resource parts is configured to have Qsymbols, wherein P and Q are set so that a difference between P and Q isto be at most 1, and wherein N, P and Q are natural numbers.
 30. Themethod of claim 25, wherein the UL preemption indicator includes abitmap including N bits, and each of the N bits corresponds to arespective one of N resource parts within the reference time-frequencyresource, wherein each of mod (S, N) resource parts among the N resourceparts includes ceil (S/N) symbols, and each of N-mod (S, N) resourceparts among the N resource parts includes floor (S/N) symbols, andwherein S is a number of symbols within the reference time-frequencyresource, N is a natural number, mod ( ) represents a modulo function,ceil ( ) represents a ceiling function, and floor ( ) represents aflooring function.
 31. A base station (BS) of a wireless communicationsystem, the BS comprising: a communication module; and a processorconfigured to control the communication module, wherein the processor isconfigured to: transmit configuration information related to a cyclicperiod for monitoring an uplink (UL) preemption indicator; transmitscheduling information for a physical uplink shared channel (PUSCH)reception; after a transmission of the scheduling information, transmita common physical downlink control channel (PDCCH) including the ULpreemption indicator during a monitoring time configured by the cyclicperiod; and based on the PUSCH reception being overlapped with at leastone resource part indicated by the UL preemption indicator within areference time-frequency resource, disregard a portion of the PUSCHreception based on the at least one resource part, wherein a startingtime of the reference time-frequency resource is located after themonitoring time, at least by a time interval associated with a PUSCHprocessing time.
 32. The BS of claim 31, wherein the referencetime-frequency resource excludes a downlink symbol configured accordingto a semi-static downlink (DL)/UL assignment.
 33. The BS of claim 31,wherein the PUSCH processing time is a minimum time required for a userequipment (UE) to receive a PDCCH for scheduling the PUSCH and totransmit the PUSCH.
 34. The BS of claim 31, wherein the UL preemptionindicator includes a bitmap including N bits, and each of the N bitscorresponds to a respective one of N resource parts within the referencetime-frequency resource, wherein each of one or more first resourceparts among the N resource parts is configured to have P symbols, andeach of remaining second resource parts among the N resource parts isconfigured to have Q symbols, wherein P and Q are set so that adifference between P and Q is to be at most 1, and wherein N, P and Qare natural numbers.
 35. The BS of claim 31, wherein the UL preemptionindicator includes a bitmap including N bits, and each of the N bitscorresponds to a respective one of N resource parts within the referencetime-frequency resource, wherein each of mod (S, N) resource parts amongthe N resource parts includes ceil (S/N) symbols, and each of N-mod (S,N) resource parts among the N resource parts includes floor (S/N)symbols, and wherein S is a number of symbols within the referencetime-frequency resource, N is a natural number, mod ( ) represents amodulo function, ceil ( ) represents a ceiling function, and floor ( )represents a flooring function.
 36. A method for operating a basestation (BS) of a wireless communication system, the method comprising:transmitting configuration information related to a cyclic period formonitoring an uplink (UL) preemption indicator; transmitting schedulinginformation for a physical uplink shared channel (PUSCH) reception;after a transmission of the scheduling information, transmitting acommon physical downlink control channel (PDCCH) including the ULpreemption indicator during a monitoring time configured by the cyclicperiod; and based on the PUSCH reception being overlapped with at leastone resource part indicated by the UL preemption indicator within areference time-frequency resource, disregarding a portion of the PUSCHreception based on the at least one resource part, wherein a startingtime of the reference time-frequency resource is located after themonitoring time, at least by a time interval associated with a PUSCHprocessing time.
 37. The method of claim 36, wherein the referencetime-frequency resource excludes a downlink symbol configured accordingto a semi-static downlink (DL)/UL assignment.
 38. The method of claim36, wherein the PUSCH processing time is a minimum time required for auser equipment (UE) to receive a PDCCH for scheduling the PUSCH and totransmit the PUSCH.
 39. The method of claim 36, wherein the ULpreemption indicator includes a bitmap including N bits, and each of theN bits corresponds to a respective one of N resource parts within thereference time-frequency resource, wherein each of one or more firstresource parts among the N resource parts is configured to have Psymbols, and each of remaining second resource parts among the Nresource parts is configured to have Q symbols, wherein P and Q are setso that a difference between P and Q is to be at most 1, and wherein N,P and Q are natural numbers.
 40. The method of claim 36, wherein the ULpreemption indicator includes a bitmap including N bits, and each of theN bits corresponds to a respective one of N resource parts within thereference time-frequency resource, wherein each of mod (S, N) resourceparts among the N resource parts includes ceil (S/N) symbols, and eachof N-mod (S, N) resource parts among the N resource parts includes floor(S/N) symbols, and wherein S is a number of symbols within the referencetime-frequency resource, N is a natural number, mod ( ) represents amodulo function, ceil ( ) represents a ceiling function, and floor ( )represents a flooring function.